Towards mastering terahertz waves ?

Towards mastering terahertz waves ?

The terahertz waves span frequency ranges between the infrared spectrum (used, for example, for night vision) and gigahertz waves (which find their application, among other, in Wi-Fi connections). Terahertz waves allow for the detection of materials that are undetectable at other frequencies. However, the use of these waves is severely limited by the absence of…

Elastic properties revealed by thermal diffuse x-ray scattering

Elastic properties revealed by thermal diffuse x-ray scattering

High-precision measurements of thermal diffuse x-ray scattering revealed that the full elasticity tensor can accurately be obtained in a single crystal diffraction experiment. The new method opens the perspective to determine elastic properties together with crystal structure under the same experimental conditions. The results published in Physical Review Letters show, that absolute values can be…

Electromagnon dispersion probed by inelastic X-ray scattering in LiCrO2

Electromagnon dispersion probed by inelastic X-ray scattering in LiCrO2

Lattice vibrations (phonons) in crystals are typically weakly interacting with the electronic degrees of freedom, such as charge and spin fluctuations. Researchers in the team of Prof. Rüegg (DQMP, University of Geneva and LNS, Paul Scherrer Institute) together with collaborators from the École polytechnique fédérale de Lausanne, Japan and the USA discovered an unexpectedly strong…

Plenary talk of Carmine Senatore at the Applied Superconductivity Conference

Plenary talk of Carmine Senatore at the Applied Superconductivity Conference

During the plenary series at Applied Superconductivity Conference (ASC 2016), Prof. Carmine Senatore gave a talk entitled “30 Years to High Temperature Superconductivity: Status and Perspectives”. The aim of this presentation is to illustrate the close synergetic relationship between evolution of the material understanding and advancement in the superconductor technology. See the video.

Marta Gibert receives the Swiss Physical Society (SPS) prize

Marta Gibert receives the Swiss Physical Society (SPS) prize

Marta Gibert receives the Swiss Physical Society (SPS) Prize sponsored by IBM for her research on magnetic coupling at oxide interfaces, particularly in the interface engineering of heterostructures combining nickelates and manganites. The results led to the publications: “Exchange bias in LaNiO3–LaMnO3 superlattices“, M. Gibert, et al., Nature Materials 11, 195 (2012). “Interfacial Control of Magnetic Properties…

Nicolas Gisin’s and Thierry Giamarchi’s conferences at the French Academy of Sciences

Nicolas Gisin’s and Thierry Giamarchi’s conferences at the French Academy of Sciences

Thierry Giamarchi and Nicolas Gisin gave a conference during the French Academy of Sciences colloquia, organized on the theme “Hundred years of quantum revolutions”. Thierry Giamarchi, “Peut-on toucher la Mécanique Quantique ?” Nicolas Gisin “Quand la Science rejoint la science-fiction” See the videos  

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…

Réalisation : Sur Mesure concept