Topological properties of exotic matter – Interview with Thierry Giamarchi, CQFD, RTSla1ère
Selectively conductive or insulating

Selectively conductive or insulating

  Some materials hold surprising — and possibly useful — properties: Neodymium nickel oxide is either a metal or an insulator, depending on temperature. This characteristic makes the material a potential candidate for transistors in modern electronic devices. To understand how neodymium nickel oxide makes the transition from metal to insulator and vice versa, researchers…

Observation of Fermi arcs in the type-II Weyl semimetal MoTe2

Observation of Fermi arcs in the type-II Weyl semimetal MoTe2

Crystalline solids have particlelike, low-energy excitations — so-called quasiparticles — that describe collective states of many electrons interacting with the atomic nuclei. In 2015, scientists predicted the existence of an exotic new quasiparticle, dubbed a type-II Weyl fermion, that breaks the Lorentz invariance of special relativity and has no direct analog in the standard model…

Superconductivity: after the scenario, the staging

Superconductivity: after the scenario, the staging

Superconductivity with a high critical temperature (high Tc) continues to present a theoretical mystery. While this phenomenon is experimentally well established, no scientist has managed to explain its mechanism. In the late 90’s, the British physicist Anthony Leggett proposed a scenario based on the Coulomb energy. Today, researchers at the University of Geneva (UNIGE), Switzerland,…

Bismuth for future valleytronics

Bismuth for future valleytronics

Valleytronics is an emerging field in electronics, where one plays with the momentum of electrons rather than with their electric charge. As the attainable momenta cluster near the minima (the so-called valleys) of the conduction band, the electrons effectively acquire an additional valley index, similar to the well-known charge and the spin. This extra ‘flavor’…

A positive step towards negative capacitance – towards more energy-efficient transistors

A positive step towards negative capacitance – towards more energy-efficient transistors

An international collaboration involving researchers from the University of Geneva, and colleagues from England, Spain, France and Luxembourg has demonstrated that destabilising the spontaneous polarisation of a special class of materials known as ferroelectrics gives rise to the phenomenon of negative capacitance that could one day lead to transistors with reduced power consumption. This research…

Alberto de la Torre receives the “Prix Vacheron Constantin des Sciences 2016”

Alberto de la Torre receives the “Prix Vacheron Constantin des Sciences 2016”

Alberto de la Torre has been awarded the “Prix Vacheron Constantin des Sciences 2016” for his doctoral thesis entitled Spectroscopic Studies of Layered Iridium Oxides and reporting “the doping evolution of the electronic structure of the single and bilayer iridates Sr2IrO4 and Sr3Ir2O7 from angle resolved photoemission (ARPES) experiments”. This prize encourage young students from the Faculty…

Switzerland winds up superconductivity

Switzerland winds up superconductivity

The unusual electronic properties of some superconducting materials permit lossless and dense electrical currents at very low temperatures, even in high magnetic fields. Conductors made of these materials are thus ideal for winding coils to generate very high magnetic fields, which are essential for a number of applications like magnetic medical imaging, magnetic resonance spectroscopy…

The LTA at the trade show EPHJ, June 14-17

The LTA at the trade show EPHJ, June 14-17

The Laboratory of Advanced Technology (LTA) will welcome you on the booth “Genève Innovation” (G111) at the trade show EPHJ-EPMT-SMT at Palexpo, Geneva, from June 14 till 17, 2016. The LTA is a joint platform of the University of Geneva and the University of Applied Sciences and Arts of Western Switzerland – Geneva designed to…

EuroCirCol – Interview of Prof. Carmine Senatore

EuroCirCol – Interview of Prof. Carmine Senatore

“The Horizon 2020 project EuroCirCol, coordinated by CERN, aims to assess the feasibility, reliability and cost effectiveness of key technologies for the next-generation hadron collider. For this project, coordinated by CERN, 16 partners from 9 countries work together to develop innovative designs for the collider ring, accelerator magnets and a cryogenic beam vacuum system.” The…

Phonon spectroscopy reveals important details of geophysical relevant materials

Phonon spectroscopy reveals important details of geophysical relevant materials

Using inelastic x-ray scattering and parameter-free calculations researchers provide the first complete and fully consistent lattice dynamics description of MgSiO3-brigmanite, the main constituent of the Earth’s lower mantle and one of the most important Earth’s minerals. The present work published in Geophysical Research Letters constitutes an important milestone fully validating the lattice dynamics calculation against…

Generation of « tailored » magnetic materials

Generation of « tailored » magnetic materials

Every day, new technologies require more precision in the intrinsic properties of the materials used. To meet increasingly specific requirements, physicists are interested in a generation of artificial materials, the properties of which can be controlled. Researchers at the University of Geneva (UNIGE), Switzerland, in collaboration with French and English teams, have succeed in manipulating…

Réalisation : Sur Mesure concept