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Contenu archivé le 2022-12-23

Mesoscopic fluctuation effects in the fractional quantum Hall regime 'Mesofrac'

Objectif



The fractional quantum Hall effect has generated an enormous amount of interest, and has been extensively investigated since its discovery by Tsui, Stšrmer and Gossard in 1982. A two-dimensional electron gas in a perpendicular magnetic field and at low temperatures shows quantized Hall conductance and vanishing longitudinal resistivity when the number of Landau levels that are filled corresponds to a simple rational fraction. In spite of more than a decade of intensive research into the effect, recent new phenomena in this area have nevertheless considerably changed our fundamental approach to the problem. The recently proposed composite fermion model of the fractional quantum Hall effect suggests that the electron quantum state at the half-filled lowest Landau level can be represented as a non-interacting gas of new quasiparticles (composite fermions) moving in zero magnetic field and exhibiting conventional metallic behaviour.

A study on the mesoscopic interference effects of these composite fermions in order to uncover new aspects of quantum interference in electron systems, and to shed more light on the nature of the composite fermions themselves, will be carried out. The joint research project will consist of the fabrication of the nanostructures (Novosibirsk), transport measurements (Novosibirsk and Grenoble), and the study of the mesoscopic photovoltaic through microwave radiation experiments (Novosibirsk and Leoben).

The three partners in the collaboration have complementary expertise and facilities which will ensure the success of the project: the Laboratory of Quantum Phenomena in Semiconductors in Novosibirsk, is equipped for MBE growth, electron beam lithography and reactive ion-etching, and can also perform low temperature transport and microwave investigations in magnetic fields up to 12 T. The Microstructures Research Group in Grenoble, can provide a 31 T system for making measurements at temperatures down to 280 mK, as well as a 17 T superconducting magnet for measurements down to 30 mK. The group at Montanuniversitët, Leoben, offers an internationally recognised expertise in microwave radiation effects in 2D electron gases, vital for the proposed microwave measurements.

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Régime de financement

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Coordinateur

Centre National de la Recherche Scientifique
Contribution de l’UE
Aucune donnée
Adresse
Avenue des Martyrs 25
38042 Grenoble
France

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Participants (2)