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Tuning the valley and chiral quantum state of Dirac electrons with high magnetic fields

An international group of physicists has observed the chirality of graphene electrons and controlled their valley polarization by using the high magnetic fields of the Laboratoire National des Champs Magnétiques Intenses in Grenoble and the High Field Magnet Laboratory at Radboud University in the Netherland. The finding is in particular interesting for valleytronics, a new scientific field which aims to store information in pseudospins. Science published the results on August 5.

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European Magnetic Field Laboratory created

At 12:00 on 27th January 2015, the European Magnetic Field Laboratory (EMFL) was formally founded in Brussels. The founding organisations signed, in front of a notary in Brussels, the deed to create together the legal entity EMFL. The French CNRS (Centre National de la Recherche Scientifique), the German research center HZDR (Helmholtz-Zentrum Dresden-Rossendorf) and the Dutch RU/FOM (Radboud University Nijmegen and Foundation for Fundamental Research on Matter) thereby created a joint (...)

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Observation of fast Auger scattering in Landau-quantized graphene

Graphene subject to the external magnetic field, with its electronic states quantized into a discrete Landau levels, represents a natural playground to study interactions among charged Dirac-type carriers. Fractional quantum Hall effect, nowadays widely explored in both graphene monolayer and bilayer, is the most representative demonstration of such correlated-electron phenomena. A recent publication, resulting from an international collaboration of researchers from Germany, France, and (...)

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LNCMI Emeritus researcher awarded the French Legion of Honor

On 7th November 2014, Jean-Louis Tholence, Emeritus researcher and former director of the LNCMI was awarded the French decoration of the Legion of Honour, which rewarding his whole career in the CNRS, as well as his present commitment to keeping the historical knowledge of the Grenoble scientific area (called the Polygone scientifique).

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Imaging the electronic band structure of a stack of N-layer graphene using magneto-Raman spectroscopy

The electronic properties of bilayer graphene drastically differ from those of monolayer graphene. These two (quasi)bidimensional systems are the building blocks necessary to describe the electronic properties of the family of stacks of N-layer graphene, up to the limit of the bulk material, graphite. A detailed study of the members of this family of electronic systems could reveal new quantum transport regimes, potentially useful for future applications. Researchers from the Institut de (...)

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Young LNCMI researcher awarded the Bryan R. Coles prize during the SCES 2014 confernece in Grenoble

David Le Boeuf, young researcher arrived at the LNCMI in Grenoble beginning of 2014, was awarded the "Bryan R. Coles prize" – for a person who has made significant contributions to the experimental study or discovery of strongly correlated electron materials and phenomena, early career scientists, where early is defined as no more than 8 years of active research past PhD. This award was given in the framework of the conference SCES 2014 - International Conference on Strongly (...)

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Capacitance spectroscopy of the Hofstadter butterfly

In a large international collaboration led by Dr Artem Mishchenko and Prof. Andre Geim from The University of Manchester, researchers in LNCMI-Grenoble have employed high-sensitivity capacitance measurements under magnetic fields as high as 30 T to probe the physics of the recently discovered “Hofstadter butterfly” in Graphene-BN superlattices. Graphene capacitance as a function of the magnetic field B and the gate voltage Vb used to tune the carrier density around the Dirac point (Vb=0). (...)

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LNCMI researcher awarded the EMFL prize 2014 for his work on massless electrons in 3D

Milan Orlita was awarded the EMFL prize for his recent works on Massless electrons in 3D during the User Meeting, annual EMFL event, on 19th June 2014.

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Critical Doping for the Onset of a Two-Band Superconducting Ground State in SrTiO3−δ

In doped SrTiO3 superconductivity persists down to an exceptionally low concentration of mobile electrons. This restricts the relevant energy window and possible pairing scenarios. We present a study of quantum oscillations and superconducting transition temperature Tc as the carrier density is tuned from 1017 to 1020 cm−3 and identify two critical doping levels corresponding to the filling thresholds of the upper bands. At the first critical doping, which separates the single-band (...)

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Electrical Switch to the Resonant Magneto-Phonon Effect in Graphene

Atomic vibrations of a graphene crystal, phonons, can hybridize with electronic excitations. This hybridization is particularly pronounced when a magnetic field is applied perpendicular to the plane of the two dimensional crystal with an intensity tuned so that the energy of electronic excitations coincides with that of the phonon. This effect is called the magneto-phonon effect and manifests itself through pronounced variations of the phonon energy each time an electronic excitation is (...)

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Discovering massless electrons in 3D

Massless electrons in 3D Electrons in solids sometimes behave as relativistic massless particles. Interesting properties of such electrons were largely explored in one- and two-dimensional systems (carbon nanotubes, graphene and surfaces of topological insulators). The electronic states with linear, photon-like, dispersions in all three dimensions are now demonstrated experimentally. They appear in a zinc-blende crystal, HgCdTe, at the point of the semiconductor-to-semimetal topological (...)

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Archives - News 2012

Archives - News 2013