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Archives - News 2013

Researchers demonstrate attractive interactions in a Tomonaga-Luttinger liquid

Understanding quantum many body phenomena is a fundamental challenge to modern science, and remains a formidable task in most cases. However, when interacting quantum particles, either bosons or fermions, are confined to one dimension, certain universal features emerge such that a detailed effective description becomes available. This canonical phase, with peculiar properties like algebraic correlations and fractionalized excitations, is called the Tomonaga-Luttinger liquid (TLL). All known (...)

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Phase space for the breakdown of the quantum Hall effect in epitaxial graphene

The quantum Hall effect in two – dimensional electron gases is characterised by a vanishing longitudinal resistivity and a quantised Hall resistance ρxy=h/νe2 for integer ν. The Hall resistance, determined by Planck’s constant h and the charge of an electron e, is used as a quantum standard to which all other electrical resistances can be accurately compared. The limiting factor for the accuracy is determined by the maximum current the Hall bar can carry whilst maintaining the (...)

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Emergence of charge order from the vortex state of a high-temperature superconductor

There are many materials in which the electron density spontaneously varies in space instead of being uniform. This is called charge order or charge-density-wave order. Although already observed under various forms in some cuprate superconductors at high-temperature, this phenomenon had not, until recently, been considered as important or universal in these materials. In 2011, however, the discovery by researchers at LNCMI Grenoble of charge order in YBa2Cu3Oy has given a new twist to the (...)

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Measure the speed of sound to understand the origins of superconductivity

En étudiant les légères modifications de la vitesse du son dans un supraconducteur à haute température soumis à un champ magnétique intense, des physiciens toulousains, grenoblois et canadiens ont mis en évidence une transition de phase où la densité de charge électrique est modulée. Cette transition, habituellement masquée par la supraconductivité pourrait jouer un rôle dans le mécanisme de supraconductivité à haute température... Read the whole article (in french) Access to the publication on Nature of (...)

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Special Issue of the Proceedings of the French National Academy of Science on the Physics in High Magnetic Field

A special issue dated on January 2013 of the Comptes Rendus Physique, i.e., the Proceedings of the French National Academy of Science, gives an overview of the recent developments in high magnetic field science and technology from a European perspective. This issue reviews the major scientific topics that intensively use high magnetic fields, like cuprate and pnictide superconductors, heavy fermions, organic conductors, semiconductor quantum dots and graphene. Terahertz (...)

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ERC advanced grant goes to LNCMI researcher

Marek Potemski, a leader of the "Semiconductors & Nanophysics" group at the LNCMI-Grenoble, has been awarded a five year ERC Advanced Grant. The implementation of this project, entitled: "Magneto-optics of layered materials: exploring many-body physics in electronic systems with unconventional bands", will enable to significantly expand the recent research activities of Potemski’s group in the area of fundamental properties of the emergent class of (...)

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