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…

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…

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…

Discovering the secrets of oxide electronics

Discovering the secrets of oxide electronics

Strontium titanate (SrTiO3) has been very well studied over the last decade, and we can easily measure many of its unusual properties such as superconductivity at very low carrier density. But until now we have lacked an understanding of what gives rise to this material’s special properties. A team of researchers using Diamond’s Angle-Resolved Photoemission Spectroscopy…

Graphene is both transparent and opaque to radiation

Graphene is both transparent and opaque to radiation

A microchip that filters out unwanted radiation with the help of graphene has been developed by scientists from the EPFL and tested by researchers of the University of Geneva (UNIGE). The invention could be used in future devices to transmit wireless data ten times faster.  EPFL and UNIGE scientists, have developed a microchip using graphene…

Superconductivity seen in a new light

Superconductivity seen in a new light

Superconducting materials have the characteristic of letting an electric current flow without resistance. The study of superconductors with a high critical temperature discovered in the 1980s remains a very attractive research subject for physicists. Indeed, many experimental observations still lack an adequate theoretical description. Researchers from the University of Geneva (UNIGE) in Switzerland and the…

A new era for electronic materials

A new era for electronic materials

Impressive scientific developments are changing the way in which we look at electronic materials. For many different substances, it is now possible to realize perfect crystals only one or a few atom thick, whose electronic properties can be controlled in ways that would have been considered as science fiction only a few years ago. The…

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