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A European Collaboration to Investigate Superconducting Magnets for Next Generation Heavy Ion Therapy
Rossi L, Ballarino A, Barna D, Benedetto E, Calzolaio C, Ceruti G, De Matteis E, Echeandia A, Ekelof T, Farinon S, Felcini E, Gehring M, Kirby G, Lecrevisse T, Lucas J, Mariotto S, Munilla J, Musenich R, Pampaloni A, Pepitone K, Perini D, Popovic D, Prioli M, Pullia M, Quettier L, Sanfilippo S, Senatore C, Shabagin E, Sorbi M, Statera M, Tommasini D, Toral F, Valente R, Veres D, Vieweg M.

IEEE transactions on applied superconductivity. 2022;32(4):1-7

Next generation ion therapy magnets both for gantry and for accelerator (synchrotron) are under investigation in a recently launched European collaboration that, in the frame of the European H2020 HITRIplus and I.FAST programmes, has obtained some funding for work packages on superconducting…

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A Heavy Fermion Zn-Deficient CaBe2Ge2-Type Phase with Rare Ce-Based Ferromagnetism and Large Magnetoresistance
Lefèvre R, von Rohr F.

Chemistry of materials. 2022;34(5):2352-2360

We report on the hitherto unknown compound CeZn2−δGe2 (δ ≈ 0.41). We find that this compound crystallizes in a defect version of the well-known CaBe2Ge2 structure type. The phase forms in a Zn/In flux and with Zn deficiency on one of its crystallographic sites. We find that the compound…

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A Laser-ARPES View of the 2D Electron Systems at LaAlO3/SrTiO3 and Al/SrTiO3 Interfaces
Mckeown Walker S, Boselli M, Martínez EA, Gariglio S, Bruno FY, Baumberger F.

Advanced electronic materials. 2022;:2101376

We have measured the electronic structure of the two-dimensional electron system (2DES) found at the Al/SrTiO3 (Al/STO) and LaAlO3/SrTiO3 (LAO/STO) interfaces by means of laser angle resolved photoemission spectroscopy, taking advantage of the large photoelectron escape depth at low photon energy…

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Charge-Transfer and dd excitations in AgF2
Bachar N, Koteras K, Gawraczynski J, Trzciński W, Paszula J, Piombo R, Barone P, Mazej Z, Ghiringhelli G, Nag A, Zhou K-J, Lorenzana J, Van Der Marel D, Grochala W.

Physical Review Research. 2022;4(2):023108

Charge-transfer insulators are the parent phase of a large group of today's unconventional high-temperature superconductors. Here we study experimentally and theoretically the interband excitations of the charge-transfer insulator silver fluoride AgF2, which has been proposed as an excellent…

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Electronic structure of the highly conductive perovskite oxide SrMoO3
Cappelli E, Hampel A, Chikina A, Guedes EB, Gatti G, Hunter AS, Issing J, Biskup N, Varela M, Dreyer CE, Tamai A, Georges A, Bruno FY, Radovic M, Baumberger F.

Physical review materials. 2022;6:075002

We use angle-resolved photoemission to map the Fermi surface and quasiparticle dispersion of bulk-like thin films of SrMoO$_3$ grown by pulsed laser deposition. The electronic self-energy deduced from our data reveals weak to moderate correlations in SrMoO$_3$, consistent with our observation of…

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Electrostatically Driven Polarization Flop and Strain‐Induced Curvature in Free‐Standing Ferroelectric Superlattices
Li Y, Zatterin E, Conroy M, Pylypets A, Borodavka F, Björling A, Groenendijk DJ, Lesne E, Clancy AJ, Hadjimichael M, Kepaptsoglou D, Ramasse QM, Caviglia A, Hlinka J, Bangert U, Leake SJ, Zubko P.

Advanced materials. 2022;:2106826

The combination of strain and electrostatic engineering in epitaxial heterostructures of ferroelectric oxides offers many possibilities for inducing new phases, complex polar topologies, and enhanced electrical properties. However, the dominant effect of substrate clamping can also limit the…

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Expanded solid-solution behavior and charge-discharge asymmetry in NaxCrO2 Na-ion battery electrodes
Jakobsen CL, Brighi M, Andersen BP, Ducrest G, Cerny R, Ravnsbæk DB.

Journal of power sources. 2022;535:231317

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Formation and propagation of cracks in RRP Nb3Sn wires studied by deep learning applied to x-ray tomography
Bagni T, Mauro D, Majkut M, Rack A, Senatore C.

Superconductor science and technology. 2022;35(10):104003

This paper reports a novel non-destructive and non-invasive method to investigate crack formation and propagation in high-performance Nb$_{3}$Sn wires by combining x-ray tomography and deep learning networks. The next generation of high field magnet applications relies on the development of new…

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Functionally doped infinite-layer nickelates
Gabay M, Gariglio S, Triscone J-M.

Nature materials. 2022;21(2):139-140

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Generation of Tunable Stochastic Sequences Using the Insulator–Metal Transition
Del Valle Granda J, Salev P, Gariglio S, Kalcheim Y, Schuller IK, Triscone J-M.

Nano letters. 2022;

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Heating-Induced Performance Degradation of REBa2Cu3O7–x Coated Conductors: An Oxygen Out-Diffusion Scenario with Two Activation Energies
Bonura M, Cayado Llosa P, Konstantopoulou K, Alessandrini M, Senatore C.

ACS applied electronic materials. 2022;

The degradation of the superconducting properties of REBa2Cu3O7−x coated conductors when heated above 150 °C is a topic of concern for any REBa2Cu3O7−x-based applications. This study makes it clear the role of thermally activated oxygen out-diffusion processes in the modification of the…

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Incompatibility of published ac magnetic susceptibility of a room temperature superconductor with measured raw data
Hirsch JE, Van Der Marel D.

Matter and radiation at extremes. 2022;7(4):048401

A material termed “carbonaceous sulfur hydride” has recently been reported to be a high-pressure room temperature superconductor [Snider et al., Nature 586, 373 (2020)]. We have previously pointed out that certain anomalies observed in the published data for the ac magnetic susceptibility of…

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Isotope tuning of the superconducting dome of strontium titanate
Rischau W, Pulmannova D, Scheerer G, Stucky A, Giannini E, Van Der Marel D.

Physical Review Research. 2022;4(1):013019

Doped strontium titanate SrTiO3 (STO) is one of the most dilute superconductors known today. The fact that superconductivity occurs at very low carrier concentrations is one of the two reasons that the pairing mechanism is not yet understood, the other being the role played by the proximity to a…

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Light sources with bias tunable spectrum based on van der Waals interface transistors
Henck H, Mauro D, Domaretskiy D, Philippi M, Memaran S, Zheng W, Lu Z, Shcherbakov D, Lau CN, Smirnov D, Balicas L, Watanabe K, Taniguchi T, Fal’ko VI, Gutierrez Lezama I, Ubrig N, Morpurgo A.

Nature communications. 2022;13(1):3917

Light-emitting electronic devices are ubiquitous in key areas of current technology, such as data communications, solid-state lighting, displays, and optical interconnects. Controlling the spectrum of the emitted light electrically, by simply acting on the device bias conditions, is an important…

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Magnetic field tuning of valley population in the Weyl phase of Nd2Ir2O7
Kapon I, Rischau W, Michon B, Wang K, Xu B, Yang Q, Nakatsuji S, Van Der Marel D.

Physical Review Research. 2022;4(2):023056

The frustrated magnet Nd 2 Ir 2 O7 , where strong correlations together with spin-orbit coupling play a crucial role, is predicted to be a Weyl semimetal and to host topological pairs of bulk Dirac-like valleys. Here we use an external magnetic field to manipulate the localized rare-earth 4f…

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Metal hydroborates: From hydrogen stores to solid electrolytes
Cerny R, Murgia F, Brighi M.

Journal of alloys and compounds. 2022;895:162659

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Metal to insulator transition at the surface of V2O3 thin films: An in-situ view
Caputo M, Jandke J, Cappelli E, Chaluvadi SK, Bonini Guedes E, Naamneh M, Vinai G, Fujii J, Torelli P, Vobornik I, Goldoni A, Orgiani P, Baumberger F, Radovic M, Panaccione G.

Applied surface science. 2022;574:151608

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Probing Magnetism in Exfoliated VI3 Layers with Magnetotransport
Soler Delgado D, Yao F, Dumcenco D, Giannini E, Li J, Occhialini CA, Comin R, Ubrig N, Morpurgo A.

Nano letters. 2022;:2c01361

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Quasi 1D Electronic Transport in a 2D Magnetic Semiconductor
Wu F, Gutierrez Lezama I, Lopéz‐Paz SA, Gibertini M, Watanabe K, Taniguchi T, Von Rohr FO, Ubrig N, Morpurgo A.

Advanced materials. 2022;:2109759

We investigate electronic transport through exfoliated multilayers of CrSBr, a 2D semiconductor that is attracting attention because of its magnetic properties. We find an extremely pronounced anisotropy that manifests itself in qualitative and quantitative differences of all quantities measured…

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Quenching the bandgap of two-dimensional semiconductors with a perpendicular electric field
Domaretskiy D, Philippi M, Gibertini M, Ubrig N, Gutierrez Lezama I, Morpurgo A.

Nature nanotechnology. 2022;

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Resonant Inelastic X-Ray Scattering Study of Electron-Exciton Coupling in High-Tc Cuprates
Barantani F, Tran M, Madan I, Kapon I, Bachar N, Asmara T c., Paris E, Tseng Y, Zhang W, Hu Y, Giannini E, Gu G, Devereaux T p., Berthod C, Carbone F, Schmitt T, Van Der Marel D.

Physical review. X. 2022;12(2):021068

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Room-temperature superconductivity — or not? Comment on Nature 586, 373 (2020) by E. Snider et al
Van Der Marel D, Hirsch JE.

International journal of modern physics b. 2022;:2375001

Recently, the discovery of room-temperature superconductivity was announced for a carbonaceous sulfur hydride (CSH) under high pressure [E. Snider et al., Nature 586, 373 (2020)]. The evidence for superconductivity was based on resistance and magnetic susceptibility measurements. In the figures…

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Smooth velocity fields for tracking climate change
Gaponenko I, Rohat GT, Goyette S, Paruch P, Kasparian J.

Scientific reports. 2022;12(1):2997

Describing the spatial velocity of climate change is essential to assessing the challenge of natural and human systems to follow its pace by adapting or migrating sufficiently fast. We propose a fully-determined approach, “MATCH”, to calculate a realistic and continuous velocity field of any…

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Structural and electronic properties of SrCuO2+ δ thin films
Hadjimichael M, Waelchli A, Mundet Bolos B, Mckeown Walker S, De Luca G, Herrero-Martín J, Gibert M, Gariglio S, Triscone J-M.

APL materials. 2022;10(10):101112

The layered structure of superconducting cuprates is considered to be a key ingredient to achieve high superconducting transition temperatures. In this work, we investigate the possibility of doping the SrCuO 2 infinite-layer compound by inserting additional oxygen into its structure. We observe…

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Structural Phase Transitions in closo -Dicarbadodecaboranes C2B10H12
Brighi M, Murgia F, Łodziana Z, Cerny R.

Inorganic chemistry. 2022;61(15):5813-5823

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Tomography analysis tool: an application for image analysis based on unsupervised machine learning
Bagni T, Haldi HM, Mauro D, Senatore C.

IOP SciNotes. 2022;3(1):015201

We developed a graphical user interface (GUI) to analyse tomographic images of superconducting Nb 3 Sn wires designed for the next generation accelerator magnets. The Tomography Analysis Tool (TAT) relies on the k -means algorithm, an unsupervised machine learning technique which is widely used to …

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Nido‐Hydroborate‐Based Electrolytes for All‐Solid‐State Lithium Batteries
Payandeh SH, Rentsch D, Łodziana Z, Asakura R, Bigler R, Cerny R, Battaglia C, Remhof A.

Advanced Functional Materials. 2021;31(18):2010046

Hydroborate‐based solid electrolytes have recently been successfully employed in high voltage, room temperature all‐solid‐state sodium batteries. The transfer to analogous lithium systems has failed up to now due to the lower conductivity of the corresponding lithium compounds and their high…

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A methodology for the analysis of the three-dimensional mechanical behavior of a Nb3Sn superconducting accelerator magnet during a quench
Ferradas Troitino J, Bajas H, Bianchi L, Castaldo B, Ferracin P, Guinchard M, Izquierdo S, Lorenzo JV, Mangiarotti F, Perez JC, Takala E, Vallone G, Senatore C.

Superconductor Science and Technology. 2021;34(084003)

The fast thermal and electromagnetic transients that occur in a superconducting magnet in case of a quench have the potential of generating large mechanical stresses both in the superconducting coils and in the magnet structure. While the investigation of such quench loads should generally be…

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Creep Motion of Elastic Interfaces Driven in a Disordered Landscape
Ferrero EE, Foini L, Giamarchi T, Kolton AB, Rosso A.

Annual review of condensed matter physics. 2021;12:111-134

The thermally activated creep motion of an elastic interface weakly driven on a disordered landscape is one of the best examples of glassy universal dynamics. Its understanding has evolved over the past 30 years thanks to a fruitful interplay among elegant scaling arguments, sophisticated…

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Crossover between distinct symmetries in solid solutions of rare earth nickelates
Fowlie J, Mundet Bolos B, Toulouse C, Schober A, Guennou M, Dominguez Ordonez C, Gibert M, Alexander DTL, Kreisel J, Triscone J-M.

APL Materials. 2021;9(081119)

A strong coupling of the lattice to functional properties is observed in many transition metal oxide systems, such as the ABO3 perovskites. In the quest for tailor-made materials, it is essential to be able to control the structural properties of the compound(s) of interest. Here, thin film solid…

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Degradation of domains with sequential field application
Caballero NB.

Journal of statistical mechanics. 2021;2021:103207

Recent experiments show striking unexpected features when alter- nating square magnetic field pulses are applied to ferromagnetic samples: domains show area reduction and domains walls change their roughness. We explain these phenomena with a simple scalar-field model, using a numerical protocol…

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Design, construction, and testing of no-insulation small subscale solenoids for compact tokamaks
Zhai Y, Berlinger B, Barth C, Senatore C.

Superconductor Science and Technology. 2021;34(105003)

Fusion energy systems studies (FESS) for next-step devices based on the most promising magnetic configurations indicate that high magnetic fields and high current density for magnet coil systems may reduce device size and lower the cost. High current density and radiation resistant fusion magnets…

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Designing and controlling the properties of transition metal oxide quantum materials
Ahn C, Cavalleri A, Georges A, Ismail-Beigi S, Millis AJ, Triscone J-M.

Nature Materials. 2021;

This Perspective addresses the design, creation, characterization and control of synthetic quantum materials with strong electronic correlations. We show how emerging synergies between theoretical/computational approaches and materials design/experimental probes are driving recent advances in the…

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Development and large volume production of extremely high current density YBa2Cu3O7 superconducting wires for fusion
Molodyk A, Samoilenkov S, Markelov A, Degtyarenko P, Lee S, Petrykin V, Gaifullin M, Mankevich A, Vavilov A, Sorbom B, Cheng J, Garberg S, Kesler L, Hartwig Z, Gavrilkin S, Tsvetkov A, Okada T, Awaji S, Abraimov D, Francis A, Bradford G, Larbalestier D, Senatore C, Bonura M, Pantoja AE, Wimbush SC, Strickland NM, Vasiliev A.

Scientific Reports. 2021;11(2084)

The fusion power density produced in a tokamak is proportional to its magnetic field strength to the fourth power. Second-generation high temperature superconductor (2G HTS) wires demonstrate remarkable engineering current density (averaged over the full wire), JE, at very high magnetic fields,…

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Dynamic response and roughening of ferroelectric domain walls driven at planar electrode edges
Rapin G, Ehrensperger S, Blaser C, Caballero NB, Paruch P.

Applied Physics Letters. 2021;119:242903

Understanding and controlling the motion, stability, and equilibrium configuration of ferroelectric domain walls is key for their integration into potential nanoelectronic applications, such as ferroelectric racetrack memories. Using piezoresponse force microscopy, we analyze the growth and…

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Dynamics of the electrically induced insulator-to-metal transition in rare-earth nickelates
Del Valle Granda J, Rocco R, Dominguez Ordonez C, Fowlie J, Gariglio S, Rozenberg MJ, Triscone J-M.

Physical review. B, Condensed matter. 2021;104(16):165141

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Effects of the initial axial strain state on the response to transverse stress of high-performance RRP Nb3Sn wires
Ferradas Troitino J, Bagni T, Barth C, Bordini B, Ferracin P, Gamperle L, Tommasini D, Zurmuehle D, Senatore C.

Superconductor Science and Technology. 2021;34(3):035008

High-performance Nb3Sn superconducting wires have become one of the key technologies for the development of next generation accelerator magnets. While their large critical current densities enable the design of compact accelerator-quality magnets for their operation above 10 T, the noticeable…

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Electronic structure of 2D van der Waals crystals and heterostructures investigated by spatially- and angle-resolved photoemission
Cucchi I, Lisi S, Margot F, Henck H, Tamai A, Baumberger F.

Comptes rendus. Physique. 2021;22(S4)

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Electronic transport in submicrometric channels at the LaAlO3/SrTiO3 interface
Boselli M, Scheerer G, Filippone M, Luo W, Waelchli A, Kuzmenko A, Gariglio S, Giamarchi T, Triscone J-M.

Physical review. B. 2021;103:075431

Nanoscale channels realized at the conducting interface between LaAlO3 and SrTiO3 provide a perfect playground to explore the effect of dimensionality on the electronic properties of complex oxides. Here we compare the electric transport properties of devices realized using the atomic force…

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Enhanced Room-Temperature Ionic Conductivity of NaCB 11 H 12 via High-Energy Mechanical Milling
Murgia F, Brighi M, Piveteau L, Avalos CE, Gulino V, Nierstenhöfer MC, Ngene P, de Jongh P, Cerny R.

ACS applied materials & interfaces. 2021;13(51):61346-61356

The body-centered cubic (bcc) polymorph of NaCB11H12 has been stabilized at room temperature by highenergy mechanical milling. Temperature-dependent electrochemical impedance spectroscopy shows an optimum at 45-min milling time, leading to an rt conductivity of 4 mS cm−1. Mechanical milling…

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Generalized Hydrodynamics for integrable systems
Giamarchi T.

Journal Club for Condensed Matter Physics. 2021;07

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Generalized-hydrodynamic approach to inhomogeneous quenches: correlations, entanglement and quantum effects
Alba V, Bertini B, Fagotti M, Piroli L, Ruggiero P.

Journal of statistical mechanics. 2021;2021(11):114004

We give a pedagogical introduction to the generalized hydrodynamic approach to inhomogeneous quenches in integrable many-body quantum systems. We review recent applications of the theory, focusing in particular on two classes of problems: bipartitioning protocols and trap quenches, which represent…

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HTS Accelerator Magnet and Conductor Development in Europe
Rossi L, Senatore C.

Instruments. 2021;5(8)

In view of the preparation for a post-LHC collider, in 2010 the high-energy physics (HEP) community started to discuss various options, including the use of HTS for very high-field dipoles. Therefore, a small program was begun in Europe that aimed at exploring the possibility of using HTS for…

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Hystorian: A processing tool for scanning probe microscopy and other n-dimensional datasets
Musy L, Bulanadi RAY, Gaponenko I, Paruch P.

Ultramicroscopy. 2021;228(113345)

Research in materials science increasingly depends on the correlation of information from multiple characterisation techniques, acquired in ever larger datasets. Efficient methods of processing and storing these complexdatasets are therefore crucial. Reliably keeping track of data processing is…

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Identifying atomically thin crystals with diffusively reflected light
Domaretskiy D, Ubrig N, Gutierrez Lezama I, Tran M, Morpurgo A.

2D Materials. 2021;8(045016)

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In-Field Thermal Conductivity of Ag and Cu/Ag Ba1-xKxFe2As2 Composite Conductors
Bonura M, Huang H, Liu C, Ma Y, Senatore C.

IEEE transactions on applied superconductivity. 2021;31(5):7300105

This work reports the longitudinal thermal conductivity, κ, of Ag- and Cu/Ag-sheathed Ba 1-x K x Fe 2 As 2 conductors. Our investigation has been carried out between 4 K and 80 K with magnetic fields up to 19 T. In the case of Ag-sheathed tapes, the thermal conductivity reaches maximum values of…

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Interband plasmon polaritons in magnetized charge-neutral graphene
Slipchenko TM, Poumirol J-M, Kuzmenko A, Nikitin AY, Martín-Moreno L.

Communications physics. 2021;4(1):110

Studying the collective excitations in charge neutral graphene (CNG) has recently attracted a great interest because of unusual mechanisms of the charge carrier dynamics. The latter can play a crucial role for formation of recently observed in twisted bilayer CNG graphene plasmon polaritons (GPPs)…

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Interplay between transport and quantum coherences in free fermionic systems
Jin ZT, Gautié T, Krajenbrink A, Ruggiero P, Yoshimura T.

Journal of physics. A, Mathematical and theoretical. 2021;54:404001

We study the quench dynamics in free fermionic systems in the prototypical bipartitioning protocol obtained by joining two semi-infinite subsystems pre- pared in different states, aiming at understanding the interplay between quantum coherences in space in the initial state and transport…

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Ionic gate spectroscopy of 2D semiconductors
Gutierrez Lezama I, Ubrig N, Ponomarev E, Morpurgo A.

Nature Reviews Physics. 2021;

Reliable and precise measurements of the relative energy of band edges in 2D semiconductors are needed to determine band gaps and band offsets, as well as to establish the band diagram of devices and heterostructures. However, commonly employed techniques such as optical studies and scanning…

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Large-scale thermalization, prethermalization, and impact of temperature in the quench dynamics of two unequal Luttinger liquids
Ruggiero P, Foini L, Giamarchi T.

Physical review research. 2021;3:013048

We study the effect of a quantum quench between two tunnel coupled Tomonaga-Luttinger liquids (TLLs) with different speed of sound and interaction parameter. The quench dynamics is induced by switching off the tunneling and letting the two systems evolve independently. We fully diagonalize the…

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Local and correlated studies of humidity-mediated ferroelectric thin film surface charge dynamics
Gaponenko I, Musy L, Domingo N, Stucki N, Verdaguer A, Bassiri-Gharb N, Paruch P.

npj computational materials. 2021;7(1):163

Electrochemical phenomena in ferroelectrics are of particular interest for catalysis and sensing applications, with recent studies highlighting the combined role of the ferroelectric polarisation, applied surface voltage and overall switching history. Here, we present a systematic Kelvin probe…

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Local Probe Comparison of Ferroelectric Switching Event Statistics in the Creep and Depinning Regimes in Pb(Zr0.2Ti0.8)O3 Thin Films
Tueckmantel P, Gaponenko I, Caballero NB, Agar JC, Martin LW, Giamarchi T, Paruch P.

Physical Review Letters. 2021;126(117606)

Ferroelectric materials provide a useful model system to explore the jerky, highly nonlinear dynamics of elastic interfaces in disordered media. The distribution of nanoscale switching event sizes is studied in two Pb(Zr0.2Ti0.8)O3 thin films with different disorder landscapes using piezoresponse…

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Machine learning applied to X-ray tomography as a new tool to analyze the voids in RRP Nb3Sn wires
Bagni T, Bovone G, Rack A, Mauro D, Barth C, Matera D, Buta F, Senatore C.

Scientific Reports. 2021;11(7767)

The electro-mechanical and electro-thermal properties of high-performance Restacked-Rod-Process(RRP) Nb3Sn wires are key factors in the realization of compact magnets above 15 T for the future particle physics experiments. Combining X-ray micro-tomography with unsupervised machine learning…

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Magnetic field dependence of the copper charge density wave order in a YBa2Cu3O7/Nd0.65(Ca0.7Sr0.3)0.35MnO3 superlattice
Gaina R, Sarkar S, Soulier M, Khmaladze J, Perret E, Tcakaev A, Hinkov V, Bonura M, Weschke E, Bernhard C.

Physical review. 2021;104(17):174513

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Magnetic order, disorder, and excitations under pressure in the Mott insulator Sr2IrO4
Li X, Cooper SE, Krishnadas A, de la Torre A, Perry RS, Baumberger F, Silevitch DM, Hsieh D, Rosenbaum TF, Feng Y.

Physical review. B. 2021;104(20):L201111

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Magnetic properties of a quantum spin ladder in proximity to the isotropic limit
Zvyagin SA, Ponomaryov AN, Ozerov M, Schulze E, Skourski Y, Beyer R, Reimann T, Zviagina LI, Green EL, Wosnitza J, Sheikin I, Bouillot P, Giamarchi T, Wikara JL, Turnbull MM, Landee CP.

Physical review. B. 2021;103:205131

We report on the synthesis, crystal structure, magnetic, thermodynamic, and electron-spin-resonance prop- erties of the coordination complex [Cu2(pz)3(4-HOpy)4](ClO4)4 (pz=pyrazine; 4-HOpy=4-hydroxypyridine)….

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Mechanical Behavior and Dendrite Resistance of closo ‐Hydroborate Solid Electrolyte
Brighi M, Murgia F, Cerny R.

Advanced materials interfaces. 2021;:2101254

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Multiband charge density wave exposed in a transition metal dichalcogenide
Pasztor A, Scarfato A, Spera M, Flicker F, Barreteau C, Giannini E, van Wezel J, Renner C.

Nature communications. 2021;12(1):6037

In the presence of multiple bands, well-known electronic instabilities may acquire new complexity. While multiband superconductivity is the subject of extensive studies, the possibility of multiband charge density waves (CDWs) has been largely ignored so far. Here, combining energy dependent…

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Nanoinfrared Characterization of Bilayer Graphene Conductivity under Dual-Gate Tuning
Luo W, Kuzmenko A, Qi J, Zhang N, Wu W, Ren M, Zhang X, Cai W, Xu J.

Nano letters . 2021;21(12):5151-5157

Dual-gate tuning on two-dimensional (2D) heterostructures can provide independent control of the carrier concentration and interlayer electrostatic potential, yielding novel electronic and optical properties. In this paper, by utilizing monolayer graphene as both the top gate and a plasmon…

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Near-Atomic-Scale Mapping of Electronic Phases in Rare Earth Nickelate Superlattices
Mundet Bolos B, Dominguez Ordonez C, Fowlie J, Gibert Gutierrez M, Triscone J-M, Alexander DTL.

Nano Letters. 2021;

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Nucleation of Ergodicity by a Single Mobile Impurity in Supercooled Insulators
Krause U, Pellegrin-Frachon T, Brouwer PW, Abanin D, Filippone M.

Physical review letters. 2021;126:030603

We consider a disordered Hubbard model and show that, at sufficiently weak disorder, a single spin- down mobile impurity can thermalize an extensive initially localized system of spin-up particles. Thermalization is enabled by resonant processes that involve correlated hops of the impurity and…

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Phase coherence in out-of-equilibrium supersolid states of ultracold dipolar atoms
Ilzhöfer P, Sohmen M, Durastante G, Politi C, Trautmann A, Natale G, Morpurgo GAM, Giamarchi T, Chomaz L, Mark MJ, Ferlaino F.

Nature physics. 2021;17:356-361

A supersolid is a counterintuitive phase of matter that combines the global phase coherence of a superfluid with a crystal-like self-modulation in space. Recently, such states have been experimentally realized using dipolar quantum gases. Here we inves- tigate the response of a dipolar supersolid…

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Polymorphism of Calcium Decahydrido-closo-decaborate and Characterization of Its Hydrates
Jørgensen M, Zhou W, Wu H, Udovic TJ, Paskevicius M, Cerny R, Jensen TR.

Inorganic Chemistry. 2021;60(15):10943-10957

Metal closo-borates and their derivatives have shown promise in several fields of application from cancer therapy to solidstate electrolytes partly owing to their stability in aqueous solutions and high thermal stability. We report the synthesis and structural analysis of α- and β-CaB10H10, which …

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Powder diffraction
Kaduk JA, Billinge SJL, Dinnebier RE, Henderson N, Madsen I, Cerny R, Leoni M, Lutterotti L, Thakral S, Chateigner D.

Nature reviews methods primers. 2021;1(1):77

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Pressure-induced structural transitions triggering dimensional crossover in the lithium purple bronze Li0.9Mo6O17
Tran M, Akrap A, Levallois J, Teyssier J, Schouwink P, Besnard C, Lerch P, Allen JW, Greenblatt M, Van Der Marel D.

Physical Review. B, Condensed Matter. 2021;103(23)

At ambient pressure, lithium molybdenum purple bronze (Li0.9Mo6O17) is a quasi-one dimensionalsolid in which the anisotropic crystal structure and the linear dispersion of the underlying bandsproduced by electronic correlations possibly bring about a rare experimental realization of…

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Probing the Hall Voltage in Synthetic Quantum Systems
Buser M, Greschner S, Schollwöck U, Giamarchi T.

Physical review letters. 2021;126:030501

In the context of experimental advances in the realization of artificial magnetic fields in quantum gases, we discuss feasible schemes to extend measurements of the Hall polarization to a study of the Hall voltage, allowing for direct comparison with solid state systems. Specifically, for the…

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Propagation of shear stress in strongly interacting metallic Fermi liquids enhances transmission of terahertz radiation
Valentinis DF, Zaanen J, Van Der Marel D.

Scientific Reports. 2021;11(1):7105

A highlight of Fermi-liquid phenomenology, as explored in neutral 3He, is the observation that in the collisionless regime shear stress propagates as if one is dealing with the transverse phonon of a solid. The existence of this “transverse zero sound” requires that the quasiparticle mass…

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Quantum generalized hydrodynamics of the Tonks–Girardeau gas: density fluctuations and entanglement entropy
Ruggiero P, Calabrese P, Doyon B, Dubail J.

Journal of physics. A, Mathematical and theoretical. 2021;55:024003

We apply the theory of quantum generalized hydrodynamics (QGHD) introduced in (2020 Phys. Rev. Lett. 124 140603) to derive asymptotically exact results for the density fluctuations and the entanglement entropy of a one-dimensional trapped Bose gas in the Tonks–Girardeau (TG) or hard-core limit,…

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Quenchable Porous High-Temperature Polymorph of Sodium Imidazolate, NaIm
Burazer S, Robeyns K, Guenee L, Mali G, Morelle F, Ban V, Klaser T, Filinchuk R, Cerny R, Popović J.

Crystal Growth & Design. 2021;21(2):770-778

The novel high-temperature polymorph of sodium imidazolate reported in this paper was discovered in the mechanochemical reaction of NaIm with NaBH4 and later prepared directly by thermal treatment of the room-temperature polymorph of NaIm. Solid-state NMR was used for initial elucidation of…

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Quenches in initially coupled Tomonaga-Luttinger Liquids: a conformal field theory approach
Ruggiero P, Calabrese P, Foini L, Giamarchi T.

SciPost physics. 2021;11:055

We study the quantum quench in two coupled Tomonaga-Luttinger Liquids (TLLs), from the off-critical to the critical regime, relying on the conformal field theory approach and the known solutions for single TLLs. We consider a squeezed form of the initial state, whose low energy limit is fixed in a…

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Raman spectroscopic evidence for multiferroicity in rare earth nickelate single crystals
Ardizzone I, Teyssier J, Crassee I, Kuzmenko A, Mazzone DG, Gawryluk DJ, Medarde M, Van Der Marel D.

Physical Review Research. 2021;3(033007)

The rare earth nickelates RNiO3 are metallic at high temperatures and insulating and magnetically ordered at low temperatures. The low temperature phase has been predicted to be type II multiferroic, i.e., ferroelectricand magnetic order are coupled and occur simultaneously. Confirmation of those…

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Room-Temperature Solid-State Lithium-Ion Battery Using a LiBH4–MgO Composite Electrolyte
Gulino V, Brighi M, Murgia F, Ngene P, de Jongh R, Cerny R, Baricco M.

ACS Applied Energy Materials. 2021;4(2):1228-1236

LiBH4 has been widely studied as a solid-state electrolyte in Li-ion batteries working at 120 °C due to the low ionic conductivity at room temperature. In this work, by mixing with MgO, the Li-ion conductivity of LiBH4 has been improved. The optimum composition of the mixture is 53 v/v % of MgO,…

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Roughness and dynamics of proliferating cell fronts as a probe of cell–cell interactions
Rapin G, Caballero NB, Gaponenko I, Ziegler B, Rawleigh A, Moriggi E, Giamarchi T, Brown SA, Paruch P.

Scientific reports. 2021;11(1):8869

Juxtacellular interactions play an essential but still not fully understood role in both normal tissue development and tumour invasion. Using proliferating cell fronts as a model system, we explore the effects of cell–cell interactions on the geometry and dynamics of these one-dimensional…

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Skyrmion-(Anti)Vortex Coupling in a Chiral Magnet-Superconductor Heterostructure
Petrović A P, Raju M, Tee X Y, Louat A, Maggio-Aprile I, Menezes R M, Wyszyński M J, Duong N K, Reznikov M, Renner C, Milošević M V, Panagopoulos C.

Physical Review Letters. 2021;126(117205)

We report experimental coupling of chiral magnetism and superconductivity in [IrFeCoPt]/Nb heterostructures. The stray field of skyrmions with radius ≈50 nm is sufficient to nucleate antivortices in a 25 nm Nb film, with unique signatures in the magnetization, critical current, and flux dynamics, …

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Solitonic excitations in the Ising anisotropic chain BaCo2V2O8 under large transverse magnetic field
Faure Q, Takayoshi S, Grenier B, Petit S, Raymond S, Boehm M, Lejay P, Giamarchi T, Simonet V.

Physical review research. 2021;3:043227

We study the dynamics of the quasi-one-dimensional Ising-Heisenberg antiferromagnet BaCo2V2O8 under a transverse magnetic field. Combining inelastic neutron scattering experiments and theoretical analyses by field theories and numerical simulations, we mainly elucidate the structure of the spin…

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Solution to the Quantum Symmetric Simple Exclusion Process: The Continuous Case
Bernard D, Jin ZT.

Communications in Mathematical Physics. 2021;384(2):1141-1185

The quantum symmetric simple exclusion process (Q-SSEP) is a model for quantum stochastic dynamics of fermions hopping along the edges of a graph with Brownian noisy amplitudes and driven out-of-equilibrium by injection-extraction processes at a few vertices. We present a solution for the invariant …

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Spectral weight of hole-doped cuprates across the pseudogap critical point
Michon B, Kuzmenko A, Tran M, Mc Elfresh BR, Komiya S, Ono S, Uchida S, Van Der Marel D.

Physical review research. 2021;3(4):043125

One of the most widely discussed features of the cuprate high-Tc superconductors is the presence of a pseudogap in the normal state. Recent transport and specific heat measurements have revealed an abrupt transition at the pseudogap critical point, denoted p∗, characterized by a drop in carrier…

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Strain tuning of interorbital correlations in LaVO3 thin films
Meley H, Tran M, Teyssier J, Krieger JA, Prokscha T, Suter A, Salman Z, Viret M, Van Der Marel D, Gariglio S.

Physical Review. B, Condensed Matter. 2021;103(125112)

3d^2 vanadate perovskites exhibit an unusual phase diagram where the low temperature orbital and spin orders are strongly dependent upon the rare-earth cation size. Here, we demonstrate the delicate role of strain in epitaxial LaVO3 films by performing low-energy muon spin spectroscopy and…

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Theory of cross quantum capacitance
Berthod C, Zhang H, Morpurgo A, Giamarchi T.

Physical Review Research. 2021;3(4):043036

Impressive progress in the control of atomically thin crystals is now enabling the realization of gated structures in which two electrodes are separated by atomic scale distances. The electrical capacitance of these structures is determined by phenomena that are not relevant in capacitors with…

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ToF-SIMS analysis of demineralized dentin biomodified with calcium phosphate and collagen crosslinking: effect on marginal adaptation of class V adhesive restorations
Betancourt Cordova FM, Kiss A, Krejci I, Bortolotto Ibarra T.

Materials. 2021;14(16):4535.

This study aimed to assess the effect of biomodification before adhesive procedures on the tooth-restoration interface of class V restorations located in caries-simulated vs. sound dentin, and the quality of dentin surface by time-of-flight secondary ion mass spectrometry (ToF-SIMS). Class V…

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Tuning Ginzburg–Landau theory to quantitatively study thin ferromagnetic materials
Guruciaga PC, Caballero NB, Jeudy V, Curiale J, Bustingorry S.

Journal of statistical mechanics. 2021;2021:033211

Along with experiments, numerical simulations are key to gaining insight into the underlying mechanisms governing domain wall motion in thin ferromagnetic systems. However, a direct comparison between numerical simula- tion of model systems and experimental results still represents a great…

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Ultracompact Binary Permanent Rare-Earth Magnet with 1.25-T Center Field and Fast-Decaying Stray Field
Poumirol J-M, Bercher A, Slipchenko T, Maggio-Aprile I, Renner C, Kuzmenko A.

Physical review applied . 2021;16(4):044012

We present a very-compact bicomponent-permanent-magnet design capable of generating 1.25 T in a small volume, significantly above the 0.6 T available from a single uniformly magnetized permanent magnet. In addition to the enhanced maximum field, our design drastically limits the stray field present …

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Very high upper critical fields and enhanced critical current densities in Nb3 Sn superconductors based on Nb–Ta–Zr alloys and internal oxidation
Buta F, Bonura M, Matera D, Bovone G, Ballarino A, Hopkins SC, Bordini B, Chaud X, Senatore C.

Journal of Physics: Materials. 2021;4(025003)

The inhibition of Nb3Sn grain growth in the presence of ZrO2 nanoparticles appears to be one of the most promising method for pushing the critical current densities of Nb3Sn superconducting wires to levels that meet the requirements set for the Future Circular Collider. We have investigated the…

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Wang-MacDonald d-wave vortex cores observed in heavily overdoped Bi2Sr2CaCu2O8+δ
Gazdic T, Maggio-Aprile I, Gu G, Renner C.

Physical Review X. 2021;11:031040

Low magnetic field scanning tunneling spectroscopy of individual Abrikosov vortices in heavily overdoped Bi2Sr2CaCu2O8+δ unveils a clear d-wave electronic structure of the vortex core, with a zero-bias conductance peak at the vortex center that splits with increasing distance from the core. We…

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Preprints

Anomalous quasiparticles in the zone center electron pocket of the kagomé ferromagnet Fe3Sn2
Ekahana SA, Soh Y, Tamai A, Gosálbez-Martínez D, Yao M, Hunter AS, Fan W, Wang Y, Li J, Kleibert A, Vaz CAF, Ma J, Xiong Y, Yazyev OV, Baumberger F, Shi M, Aeppli G.

2022.

One material containing kagome bilayers and featuring both exceptional magnetism and electron transport is the ferromagnetic metal Fe3Sn2. Notwithstanding the widespread interest in Fe3Sn2, crystal twinning, difficulties in distinguishing surface from bulk states, and a large unit cell have until…

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Doctoral Thesis

Optoelectronic Phenomena in 2D Materials and Heterostructures
Domaretskiy D.

2-dimensional (2D) materials have stunned the scientific community and have triggered immense interest due to their unique optoelectronic properties. These properties strongly depend on the thickness of 2D layers and can be controlled by an externally applied voltage providing experimental…

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Unconventional superconductivity, phase transitions and new polymorphs in the Sr-Ti-O system
Pulmannova D.

Strontium titanate is a cubic perovskite, which is insulating in its pristine state but becomes metallic upon electron doping. It is one of the most dilute superconductors and the pairing mechanism is unknown. In addition, SrTiO3 is a quantum paraelectric, in which zero-point fluctuations prevent…

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An optical study of the physics of the rare earth nickelates
Ardizzone I.

We report the evolution of the lattice, electronic and magnetic structure of nickelates along the series using various optical spectroscopy techniques. The crystal structures from the highest to the lowest symmetry present in the phase diagram, the electronic structure and the different probable…

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Electronic coupling in nickelate-based superlattices
Dominguez Ordonez C.

We discussed a particularly interesting interfacial effect-a coupling due to a phase boundary cost-that can be used to achieve fine control over the electronic properties of artificially-layered materials. The artificial model system, presented in this thesis, uses SmNiO3 and NdNiO3-two compounds…

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Growth and angle-resolved-photoemission studies of thin films of the metallic perovskite oxides LaNiO3 and SrMoO3
Cappelli E.

In this thesis, I present my research work on epitaxial thin films of LaNiO3 and SrMoO3, investigated by angle-resolved photoemission spectroscopy (ARPES), which yields a direct measurement of the interacting electronic structure. Thin films of the correlated transition-metal oxide LaNiO3 undergo a …

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Oxygen Control in Infinite-Layer Cuprate Heterostructures
Waelchli A.

Le mécanisme régissant la supraconductivité à haute température critique, observée dans des composés à base de cuivre et d'oxygène (cuprates), n'est à ce jour pas encore entièrement élucidé. Dans cette thèse sont étudiés des systèmes dits « infinite-layer » avec la…

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Quantum Criticality and Dimensionality in Quasi-2D Spin-Dimer Systems
Allenspach SD.

Phase transitions and their accompanying concepts of criticality and universality are a foundation stone of statistical physics. Gapped spin-dimer systems are an ideal testbed to study criticality because a quantum phase transition can be induced by a magnetic field resulting in a phase equivalent…

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Spectroscopic investigation of ionic liquid gated van der Waals semiconductors and heterostructures
Reddy BA.

The fast paced research field of quantum electronics is dominated by the investigation of 2D van der Waals materials. This class of materials consist of different properties ranging from semiconductor, semimetal, superconductor, ferromagnetic and many more. Now with a further possibility to stack…

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Professional Articles

Tantalates Transcend Titanates
Van Der Marel D.

Journal Club for Condensed Matter Physics. 2021;

A discussion is presented of three recent papers describing a breakthrough in superconductivity in electron doped KTaO3 and SrTiO3. In their pristine (undoped) form these materials are band insulators with a 3 eV gap. At room temperature they have the cubic perovskite structure and both materials…

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Book Chapters

Hydroborates as novel solid-state electrolytes
Remhof A, Cerny R.

In: Crystallography in Materials Science. de Gruyter; 2021. pp. 265-290.

Hydroborates are a promising class of superionic conductors for lithium and sodium all-solid-state batteries. They combine high ionic conductivity with (electro-) chemical and thermal stability and favorable mechanical properties. In this chapter, we elucidate their conductivity mechanism based on…

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Old Annual & Scientific Reports