Publications highlights

APL Mater. 13, 021118 (2025)

This work focuses on the complex ferroelastic/ferroelectric domain structure in the prototypical ferroelectric PbTiO₃ epitaxially strained on (110)_o-oriented DyScO₃...

ACS Nano 2025, 19, 10, 10126–10137

Advanced Science 2408343 (2025)

Materials known as multiferroics exhibit more than one primary ferroic order in a given phase. The coexistence of multiple physical phases is highly interesting because through coupling of these orders...

J. Am. Chem. Soc. 2025

Layered delafossite-type compounds and related transition metal dichalcogenides, characterized by their triangular net structures, serve as prototypical systems for exploring the intricate interplay between...

J. Mater. Chem. A, 2025, Advance Article

We herein report on a fast and convenient soft-chemical synthesis approach towards large 1T-CrTe₂ van-der-Waals crystals. This compound is formed X-ray diffraction pure, with a complete conversion...

Phys. Rev. Lett. 131, 196303 (2023)

We present a theory for band-tuned metal-insulator transitions based on the Kubo formalism. Such a transition exhibits scaling of the resistivity curves in the regime...

Nano Lett. 2024, 24, 45, 14191–14197

The epitaxial growth of complex oxides enables the production of high-quality films, yet substrate choice is restricted to certain symmetry and lattice parameters, thereby limiting the technological...

APL Mater. 12, 081120 (2024)

Rare-earth nickelates (chemical formula RNiO₃, R being a rare-earth cation) display a temperature-dependent metal-to-insulator transition (MIT) together with a breathing distortion of the...

Phys. Rev. Lett. 133, 106801 (2024)

Defects have a significant influence on the polarization and electromechanical properties of ferroelectric materials. Statistically, they can be seen as random pinning centers acting on an elastic manifold,...

Chem. Mater. 2024

The structurally related compounds NiI₂ and CoI₂ are multiferroic van der Waals materials in which helimagnetic orders exist simultaneously with electric polarization. Here, we report on ...

Mundet et al. – APL Mater. 12, 031124 (2024)

Most perovskite oxides belong to the Pbnm space group, composed of an anisotropic unit cell, A-site antipolar displacements, and oxygen octahedral tilts. Mapping the orientation of the orthorhombic unit cell...

Varbaro et al. – APL Mater. 12, 031104 (2024)

Heterostructures consisting of SmNiO₃ and NdNiO₃ alternating layers with additional LaAlO₃ spacer layers were grown and fully characterized by means of x-ray diffraction,...

Chem. Mater. 2023

The concept of topological superconductivity has attracted immense interest in the physics community recently for several reasons: First, topological superconductors represent new phases of matter, which are...

El Hamdi  et al. – Nat. Phys. (2023).

The spin–orbit interaction plays an important role in magnetism and in many quantum materials. It is the cornerstone of the physics of many electronic phases that emerge at interfaces because of broken...

Nature Communications volume 14, 4969 (2023)

In twisted two-dimensional (2D) magnets, the stacking dependence of the magnetic exchange interaction can lead to regions of ferromagnetic and antiferromagnetic interlayer order, separated by non-collinear,...

Nature Communications 14 1, 3771 (2023)

We deploy quasi-particle interference imaging using a scanning tunneling microscope to probe the presence, nature and strength of proximity induced spin-orbit coupling (SOC) in single layer graphene (SLG) on...

Domínguez et al. – Physical Review Materials 7, 065002 (2023)

In this paper we present a model system built out of artificially layered materials, allowing us to understand the interrelation of magnetic phases with the metallic-insulating phase at long length scales,...

Lichtensteiger et al. – APL Mater 11, 061126 (2023)

We study the complex ferroelastic/ferroelectric domain structure in the prototypical ferroelectric PbTiO₃ epitaxially strained on (110)_o-oriented DyScO₃ substrates, using a...

J. Phys. Mater. 6 035001. 2023

We report on the synthesis of LiCrTe₂ single crystals and on their anisotropic magnetic properties. We have obtained these single crystals by employing a Te/Li-flux synthesis method. We find...

Advanced Materials volume 35, 2211653 (2023)

Using field-effect transistors (FETs) to explore atomically thin magnetic semiconductors with transport measurements is difficult, because the very narrow bands of most 2D magnetic semiconductors cause...

Varbaro et al. – Adv. Electron.Mater.2023, 2201291

In rare earth nickelates, the metal-to-insulator transition observed as a function of temperature can be described using an electronic and a structural order parameter. The electronic one is linked to the...

Rischau et al. – Phys. Rev. B 107, 115139

We investigate the oxygen isotope effect on the VO₂ metal-insulator transition. Using an alternative method, we synthesize V¹⁶O₂ and V¹⁸O₂ crystals,...

Hadjimichael et al. – Adv. Electron.Mater.2023, 2201182

The discovery of superconductivity in doped infinite-layer nickelate thin films has brought increased attention to the behavior of the doped perovskite phase. Despite this interest, the majority of existing...

Advanced Materials, 2211993 (2023)

Ionic gating is a powerful technique to realize field-effect transistors (FETs) enabling experiments not possible otherwise. So far, ionic gating has relied on the use of top electrolyte gates, which pose...

APL Materials 10, 101112 (2022)

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...

Nature Communications volume 13, 4745 (2022)

The van-der-Waals material CrSBr stands out as a promising two-dimensional magnet. Here, we report on its detailed magnetic and structural characteristics. We evidence that it undergoes a transition to an...

Nature Nanotechnology volume 17, 1078 (2022)

Perpendicular electric fields can tune the electronic band structure of atomically thin semiconductors. In bilayer graphene, which is an intrinsic zero-gap semiconductor, a perpendicular electric field opens...

ACS Appl. Electron. Mater. 2022, 4, 3, 1318–1326

The degradation of the superconducting properties of REBa₂Cu₃O_7–x coated conductors when heated above 150 °C is a topic of concern for any...

Nature Communications volume 13, 3917 (2022)

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...

Physical Review X 12, 021062 (2022)

Explaining the mechanism of superconductivity in the high-T c cuprates requires an understanding of what causes electrons to form Cooper pairs. Pairing can be mediated by phonons, the screened Coulomb force,...

CrystEngComm, 2022,24, 3731-3740

Single crystals of transition metal oxides forming the Ruddlesden–Popper series are necessary for complete studies of their often exciting physical properties. In the strontium titanate family, crystal...

Advanced Materials (2022)

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...

Chem. Mater. 2022 vol. 34, no. 5, p. 2352-2360

We report on the hitherto unknown compound CeZn_2−δGe₂ (δ ≈ 0.41). We find that this compound crystallizes in a defect version of the well-known CaBe₂Ge₂...

Probabilistic computing is a paradigm in which data are not represented by stable bits, but rather by the probability of a metastable bit to be in a particular state. The development of this technology has...

Nature Communications volume 12, 6659 (2021)

Recent experiments on van der Waals antiferromagnets have shown that measuring the temperature (T) and magnetic field (H) dependence of the conductance allows their magnetic phase diagram to be mapped....

Chem. Mater. 2021, 33, 22, 8722–8732

Ti₂Ni and the related η-carbide structure are known to exhibit various intriguing physical properties. The Ti₂Ni structure with the cubic space group Fd3̅m is surprisingly complex,...

Nature Communications 12, 6037 (2021)

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...

Phys. Rev. Research 3, 043036 – 14 October 2021

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...

Chem. Sci., 2021, 12, 13870

Pyrite, also known as fool's gold is the thermodynamic stable polymorph of FeS₂. It is widely considered as a promising d-band semiconductor for various applications due to its intriguing physical...

Nature Physics 17, 189 (2021)

Using angle-resolved photo-emission spectroscopy we are the first to report a direct observation of the flat bands in twisted bilayer graphene. I calculated the matrix elements that determine how the flat...

Phys. Rev. Lett. 127, 127202 (2021)

In oxide heterostructures, different materials are integrated into a single artificial crystal, resulting in a breaking of inversion symmetry across the heterointerfaces. A notable example is the interface...

Phys. Rev. Research 3, 033192, 2021

We report on the structural and microscopic superconducting properties of the Ca1−xSrxAlSi solid solution. Specifically, we have realized the continuous solid solution, which for all members, other than x=0 ...

Phys. Rev. X 11, 031040 (2021)

The electronic structure of the vortex cores in copper oxide high temperature superconductors (HTS) is a long-standing puzzle. Using scanning tunneling spectroscopy at an unprecedented low magnetic field for...

Nature Physics volume 17, pages 1001–1006 (2021)

Magnonics is a research field complementary to spintronics, in which the quanta of spin waves (magnons) replace electrons as information carriers, promising lower dissipation. The development of ultrafast,...

ACS Mater. Au 2021, 1, 1, 55–61

The upper critical field is a fundamental measure of the strength of superconductivity in a material. It is also a cornerstone for the realization of superconducting magnet applications. The critical field...

Nature Physics 17, 478 (2021)

Transport measurements of twisted bilayer graphene reveal a sequence of spin and valley polarized states with Chern numbers 1, 2, 3. We can understand these states using a Hartree theory on top of a...

Science advances. 2021, vol. 7, no. 23

Van der Waals magnets provide an ideal playground to explore the fundamentals of low-dimensional magnetism and open opportunities for ultrathin spin-processing devices. The Mermin-Wagner theorem dictates that ...

Nano Lett. 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. ...

Nature Materials volume 20, pages 1462–1468 (2021)

This Perspective addresses the design, creation, characterization and control of synthetic quantum materials with strong electronic correlations. We show how emerging synergies between...

Scientific Reports volume 11, 8869 (2021)

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...

Scientific Reports, 11, 7767 (2021)

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...

Phys. Rev. Lett. 126, 117601

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...

Journal of Physics: Materials, Volume 4, Number 2, 2021

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...

Nano Lett. 2021, 21, 6, 2436–2443

Nanoscale mapping of the distinct electronic phases characterizing the metal–insulator transition displayed by most of the rare-earth nickelate compounds is fundamental for discovering the true nature of...

Dalton Trans., 2021,50, 3216-3223

We report on the phase formation and the superconducting properties in the NbS₂ system. Specifically, we have performed a series of standardized solid-state syntheses in this system, which allow us ...

Instruments 2021, 5(1), 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 ...

Nature Materials volume 20, pages 607–611 (2021)

Resonant ultrafast excitation of infrared-active phonons is a powerful technique with which to control the electronic properties of materials that leads to remarkable phenomena such as the light-induced...

Nature Physics volume 17, pp. 356–361 (2021)

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...

Phys. Rev. Lett. 125, 267603 (2020)

We present a first detailed study of the charge density wave (CDW) contrast inversion in scanning tunneling microscopy (STM) images. Combining high resolution STM imaging at different tunneling biases and...

Scientific Reports, 10, 17656 (2020)

The upper critical field sets the thermodynamic limit to superconductivity. A big gap is present between the upper-critical-field values measured in MgB₂ polycrystalline bulk superconductors and...

Nature Physics (2021)

We combine different imaging techniques and angle-resolved photoemission with simultaneous real- and momentum-space resolution (nano-ARPES) to directly map the band dispersion in twisted bilayer graphene...

2D Materials 2020, vol. 7, no. 041002

Optical selection rules in monolayers of transition metal dichalcogenides and of their heterostructures are determined by the conservation of the z-component of the total angular momentum—J_Z =...

Nature Materials volume 19, pages 1182–1187 (2020)

Controlling phase transitions in transition metal oxides remains a central feature of both technological and fundamental scientific relevance. A well-known example is the metal–insulator transition, which...

APL Materials 8, 061102 (2020)

Collective rotations and tilts of oxygen polyhedra play a crucial role in the physical properties of complex oxides such as magnetism and conductivity. Such rotations can be tuned by preparing thin films in...

Physical Review Research. 2020, vol. 2, no. 2, 023051

The discovery of the anomalous Hall effect (AHE) in bulk metallic antiferromagnets (AFMs) motivates the search of the same phenomenon in two-dimensional (2D) systems, where a quantized anomalous Hall...

Nature Materials volume 19, pages 624–629 (2020)

Although photons in free space barely interact, matter can mediate interactions between them resulting in optical nonlinearities. Such interactions at the single-quantum level result in an on-site photon...

2D Materials. 2020, vol. 7, no. 025042

Monolayer jacutingaite (Pt₂HgSe₃) has been recently identified as a candidate quantum spin Hall system with a 0.5 eV band gap, but no transport measurements have been performed so far...

Phys. Rev. Lett. 124, 106402 (2020)

We report high-resolution angle-resolved photoemission measurements on single crystals of Pt2HgSe3 grown by high-pressure synthesis. Our data reveal a gapped Dirac nodal line whose (001) projection separates...

Phys. Rev. Research 2, 013211 (2020)

The development of high-field accelerator magnets capable of providing 16-T dipolar fields is an indispensable technological breakthrough needed for the 100-TeV energy frontier targeted by the Future Circular ...

Nature Materials volume 19, pages 299–304 (2020)

Van der Waals (vdW) interfaces based on 2D materials are promising for optoelectronics, as interlayer transitions between different compounds allow tailoring of the spectral response over a broad range....

Nano Lett. 2020, 20, 2, 1322–1328

The assembly of suitably designed van der Waals (vdW) heterostructures represents a new approach to produce artificial systems with engineered electronic properties. Here, we apply this strategy to realize...

Phys. Rev. Research 1, 033114 (2019)

Combining real space and reciprocal space analysis of scanning tunneling microscopy images of transition metal dichalcogenides, we obtain real space maps of the amplitude, phase and periodicity of the complex ...

2D Materials. 2020, vol. 7, no. 1, 015007

Chromium triiodide, CrI₃, is emerging as a promising magnetic two-dimensional semiconductor where spins are ferromagnetically aligned within a single layer. Potential applications in spintronics...

Nature Communications volume 10, 2774 (2019)

Probing the local transport properties of two-dimensional electron systems (2DES) confined at buried interfaces requires a non-invasive technique with a high spatial resolution operating in a broad...

Nature Communications volume 10, 2774 (2019)

Probing the local transport properties of two-dimensional electron systems (2DES) confined at buried interfaces requires a non-invasive technique with a high spatial resolution operating in a broad...

Superconductor Science and Technology 32,  7, 075005 (2019)

High temperature superconductors, especially rare-earth barium copper oxide (REBa2Cu3O7−x or REBCO) tapes are an enabling technology for magnetic fields beyond 23.5 T, the limit of the existing technology...

Nano Lett. 2019, 19, 6, 4188–4194

In this study, we analyze how the octahedral tilts and rotations of thin films of LaNiO₃ and LaAlO₃ grown on different substrates, determined using synchrotron X-ray diffraction-measured ...

Phys. Rev. B 99, 155133 (2019)

Scanning tunneling microscopy unveils an unusual energy dependent CDW pattern in Cu intercalated TiSe₂. It is a direct manifestation of a large doping dependent CDW gap opening below the Fermi...

Phys. Rev. B 98, 235158 (2018)

The discovery of superconductivity and Mott insulation in twisted bilayer graphene has inspired this work, where we show that the correlated insulator state stems from a macroscopic charge transfer between AA ...

Reports on Progress in Physics 82, 012501 (2018)

Within the last twenty years, the status of the spin–orbit interaction has evolved from that of a simple atomic contribution to a key effect that modifies the electronic band structure of materials. It is...

We present measurements of the dynamical structure factor Sðq;ωÞ of an interacting one-dimensional Fermi gas for small excitation energies. We use the two lowest hyperfine levels of the 6Li atom to form a...

Reports on Progress in Physics. 2018, vol. 81, no. 046501

This review stands in the larger framework of functional materials by focussing on heterostructures of rare-earth nickelates, described by the chemical formula RNiO3 where R is a trivalent rare-earth...

APL Materials 6, 046102 (2018)

Rare earth vanadate perovskites exhibit a phase diagram in which two different types of structural distortions coexist: the strongest, the rotation of the oxygen octahedra, comes from the small tolerance...

Phys. Rev. Lett. 119, 237001 (2017)

Detailed scanning tunneling microsccopy and spectroscopy and original model calculations reveal the long sought after electronic signature of the vortex cores in a high temperature copper oxyde d-wave...

2D Materials 4, 041005 (2017)

Scanning tunneling microscopy of in-situ exfoliated VSe₂ reveals a non monotonic thickness dependence of the charge density wave (CDW) order parameter and phase transition temperature. Both...

Phys. Rev. B 96, 075304

Reduced dimensions can give rise to surprising effects. While a long exposure time photograph of a macroscopic moving object appears blurred, scanning tunneling microscopy images of flipping Si dimer defects...

Nature Physics volume 13, pages 624–625 (2017)

Can ferroelectricity and superconductivity occur simultaneously? Can ferroelectricity boost the superconducting critical temperature? Writing in Nature Physics, Carl Rischau and colleagues1 report...

Nature Communications volume 8, 14626 (2017)

The magnetic circular dichroism and the Faraday rotation are the fundamental phenomena of great practical importance arising from the breaking of the time reversal symmetry by a magnetic field. In most...

Advanced materials. 2017, vol. 29, no. 18, 1605197

A marked conductivity enhancement is reported in 6–11 unit cell LaNiO3 thin films. A maximal conductivity is also observed in ab initio calculations for films of the same thickness. In agreement with...

Phys. Rev. Lett. 118, 017002

Combining scanning tunneling microscopy (STM) and density functional theory, we unambiguously identify Cu intercalated on the octahedral site in the van der Waals gap of 1T-Cu_xTiSe₂. STM ...

Europhysics Letters, Volume 116, Number 1

Spin-to-charge conversion using the inverse Rashba-Edelstein effect is measured in the 2D electron liquid existing at the interface between LaAlO₃ and SrTiO₃. The effect is found to be...

Nature Physics volume 13, pages 255–261 (2017)

The dynamics of a mobile quantum impurity in a degenerate Fermi system is a fundamental problem in many-body physics. The interest in this field has been renewed due to recent ground-breaking experiments with ...

Phys. Rev. X 6, 031021 (2016)

We report a combined experimental and theoretical study of the candidate type-II Weylsemimetal MoTe2. Using laser-based angle-resolved photoemission, we resolve multiple distinct Fermi arcs. All surface...

APL Materials. 2016, vol. 4, no. 8, 086105

We present a detailed study of compressively strained Pb_xSr_1−xTiO₃ thin films grown by off-axis radio frequency magnetron sputtering on (001)-oriented Nb-doped...

Nature volume 534, pages 524–528 (2016)

The stability of spontaneous electrical polarization in ferroelectrics is fundamental to many of their current applications, which range from the simple electric cigarette lighter to non-volatile random...

New Journal of Physics, Volume 18, April 2016

We have studied the built-in voltage in heterostructures composed of ferroelectric PbTiO₃ and dielectric spacers of SrTiO₃, grown on SrTiO₃ substrates with SrRuO₃...

Nature Communications volume 7, 11227 (2016)

Dimensionality is known to play an important role in many compounds for which ultrathin layers can behave very differently from the bulk. This is especially true for the paramagnetic metal LaNiO₃,...

Nature Mater 15, 835–839 (2016)

We use the prototypical two-dimensional electron liquid (2DEL) at the SrTiO3(001) surface to reveal a remarkably complex evolution of electron–phonon coupling with the tunable carrier density of this...

Nat. Commun. 7, 11139 (2016)

Scanning tunnelling spectroscopy on very homogeneous Y123 at 0.4K lift the veil on the vortex core spectroscopy. We find that the subgap features which have been challenging theoretical modelling for over...

APL Materials 4, 060701 (2016)

In this review, we focus on the celebrated interface between two band insulators, LaAlO3 and SrTiO3, that was found to be conducting, superconducting, and to display a strong spin-orbit coupling. We discuss...

Appl. Phys. Lett. 108, 061604 (2016)

The realization of conducting nanostructures at the interface between LaAlO3 and SrTiO3 is an important step towards the realization of devices and the investigation of exotic physical regimes. We present...

New J. Phys. 18, 022001 (2016)

Our theory provides one of the most prominent explanations of enhanced superconductivity in single layer FeSe on STO substrates. It has inspired novel experiments (for example on the phonon linewidth) and...

Phys. Rev. Lett. 116, 010404 (2016)

We provided a novel method to compute integrals of motion in a quantum system with interactions and disorder, based on ‘displacement transformations’. Unlike others, our method can also compute the...

Phys. Rev. Lett. 115, 256104

Combining scanning tunneling microscopy, atomic force microscopy, and density functional theory we find that a simple necklacelike chain of single Mn atoms reproduces all the prominent features of Mn atom...

Adv. Electron.Mater.2016, 2, 1500288

The effect of intentionally introducing a large depolarization field in (001)-oriented, epitaxial Pb(Zr_0.2TiO_0.8)O₃ (PZT) ultrathin films grown on...

Phys. Rev. Lett. 115, 176402 (2015)

We report ARPES experiments on the electron doped Heisenberg antiferromagnet (Sr1−xLax)2IrO4. For a doping level of x=0.05, we find an unusual metallic state with coherent nodal excitations and an antipodal ...

Nano Lett. 2015, 15, 11, 7355–7361

The functional properties of oxide heterostructures ultimately rely on how the electronic and structural mismatches occurring at interfaces are accommodated by the chosen materials combination. We discuss...

Phys. Rev. B 92, 085126 (2015)

The classification of topological phases of matter is of utmost importance in modern condensed matter physics. We provide a simple yet effective way of observing topology by means of the experimentally...

Phys. Rev. B 92, 081101(R)

The charge density wave (CDW) in 1T-TiSe₂ is imaged by scanning tunneling microscopy in the presence of single atom defects. The detailed identification of the defects by means of density...

Phys. Rev. Lett. 115, 025701 (2015)

Our theory has been experimentally confirmed in new experiments on organic electron glasses, and provides a new benchmark for glassy theories. At the moment, this work provides the dominant explanation for...

Nature Mater 14, 883–888 (2015)

Static strain in complex oxide heterostructures has been extensively used to engineer electronic and magnetic properties at equilibrium. In the same spirit, deformations of the crystal lattice with light may...

Advances Materials, 27 (26), 3894-3899 (2015)

The origin of the two-dimensional electron gas (2DEG) stabilized at the bare surface of SrTiO3 (001) is investigated. Using high-resolution angle resolved photoemission and core level spectroscopy we show...

Nature Nanotechnology volume 10, pages 491–496 (2015)

Semiconductor quantum dots have emerged as promising candidates for the implementation of quantum information processing, because they allow for a quantum interface between stationary spin qubits and...

Nature Communications volume 6, 6678 (2015)

Understanding the nature of charge carriers at the LaAlO₃/SrTiO₃ interface is one of the major open issues in the full comprehension of the charge confinement phenomenon in oxide...

APL Materials 3, 062506 (2015)

Bulk NdNiO₃ and thin films grown along the pseudocubic (001)_pc axis display a 1st order metal to insulator transition (MIT) together with a Néel transition at T = 200 K. Here, we show...

Phys. Rev. Lett. 113, 256402 (2014)

We characterize the electron doping evolution of (Sr1−xLax)3Ir2O7. Concomitant with the metal insulator transition around x≈0.05 we find the emergence of coherent quasiparticle states forming a closed...

Phys. Rev. Lett. 113, 177601 (2014)

We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO3. Angle resolved photoemission experiments reveal highly itinerant carriers with a sixfold...

Nano Lett. 2014, 14, 8, 4205–4211

The screening efficiency of a metal–ferroelectric interface plays a critical role in determining the polarization stability and hence the functional properties of ferroelectric thin films. Imperfect...

Phys. Rev. Lett. 112, 197001 (2014)

The structural and doping nature of native atomic defects in TiSe2 are identified and characterized using scanning tunneling microscopy or spectroscopy and ab initio calculations. The dominant single atom...

APL Materials 2, 012102 (2014)

Realization of a fully metallic two-dimensional electron gas (2DEG) at the interface between artificially grown LaAlO3 and SrTiO3 thin films has been an excitingchallenge. Here we present for the first time...

Phys. Rev. B 88, 035440 (2013)

In this study, we find that isolated heavy dopants behave entirely different at the surface compared to the bulk and to lighter dopants. The common light impurity P replaces individual Si atoms and maintains...

ACS Nano 2013, 7, 5, 4422–442

Hydrogen dangling bonds are highly reactive and their selective exposure on hydrogenated Si(001) using scanning probes is developing as a powerful lithography to pattern molecules and atoms. We have found...

Nature Communications volume 3, 932 (2012)

The physical mechanisms responsible for the formation of a two-dimensional electron gas at the interface between insulating SrTiO₃ and LaAlO₃ have remained a contentious subject since...

Phys. Rev. Lett. 108, 256801 (2012)

Measuring the piezoresistance in p-type silicon up to 3GPa, we found it to decrease with compressive stress beyond the predicted saturation. This result has potential implications for the Si technology...

Nano Lett. 2012, 12, 6, 2846–2851

The performance of ferroelectric devices is intimately entwined with the structure and dynamics of ferroelectric domains. In ultrathin ferroelectrics, ordered nanodomains arise naturally in response to the...

Nature Materials volume 11, 195–198 (2012)

The wide spectrum of exotic properties exhibited by transition-metal oxides stems from the complex competition between several quantum interactions. The capacity to select the emergence of specific phases at...

Nature Communications. 2011, vol. 2, 558

One dimensional charge density wave discovered by scanning tunneling microscopy in CaC₆, a superconducting graphite intercalate compound.

Phys. Rev. B 84, 035328 (2011)

A one dimensional electronic state has been uncovered along the core of a self assembled endotaxial Si nanoline at the Si(001):H surface, with a range of promising properties to explore 1D physics.

Nature Communications. 2011, vol. 2, 212

The oxygen migration scenario for electroresistive switching in manganites gets new support. Mobile oxygen adatoms and defects have been observed by scanning tunneling microscopy with atomic resolution at the ...

Annual Review of Condensed Matter Physics. 2011, vol. 2, no. 1, p. 141-165

Complex transition metal oxides span a wide range of crystalline structures and play host to an incredible variety of physical phenomena. High dielectric permittivities, piezo-, pyro-, and ferroelectricity...

Phys. Rev. Lett. 105, 226802 (2010)

Migrating surface charges can simulate the giant piezoresistance observed in silicon nano- and micro-structures. See also comments in APS Physics Synopsis, Nature Materials Research Highlight and Physics...

Nature Materials 8, 245–247 (2009)

The PhysiScope draws the attention of Nature Materials.

Nature volume 456, pages 624–627 (2008)

Interfaces between complex oxides are emerging as one of the most interesting systems in condensed matter physics. In this special setting, in which translational symmetry is artificially broken, a variety of ...

Nature. 2008, vol. 452, no. 7188, p. 732-736

Ferroelectric thin films and superlattices are currently the subject of intensive research because of the interest they raise for technological applications and also because their properties are of...

Phys. Rev. Lett. 100, 145501 (2008)

Giant piezoresistance observed in a metal silicon hybrid structure. Article was featured in AIP Physics News Update.

Science. 2007, vol. 317, no. 5842, p. 1196-1199

At interfaces between complex oxides, electronic systems with unusual electronic properties can be generated. We report on superconductivity in the electron gas formed at the interface between two insulating...