Phase diagram of bismuth in the extreme quantum limit

Huan Yang, Benoît Fauqué, Liam Malone, Arlei B. Antunes, Zengwei Zhu, Ctirad Uher and Kamran Behnia ()
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Huan Yang: LPEM (UPMC-CNRS), Ecole Supérieure de Physique et de Chimie Industrielles
Benoît Fauqué: LPEM (UPMC-CNRS), Ecole Supérieure de Physique et de Chimie Industrielles
Liam Malone: Laboratoire National des Champs Magnétiques Intenses (CNRS)
Arlei B. Antunes: Laboratoire National des Champs Magnétiques Intenses (CNRS)
Zengwei Zhu: LPEM (UPMC-CNRS), Ecole Supérieure de Physique et de Chimie Industrielles
Ctirad Uher: University of Michigan
Kamran Behnia: LPEM (UPMC-CNRS), Ecole Supérieure de Physique et de Chimie Industrielles

Nature Communications, 2010, vol. 1, issue 1, 1-5

Abstract: Abstract Elemental bismuth provides a rare opportunity to explore the fate of a three-dimensional gas of highly mobile electrons confined to their lowest Landau level. Coulomb interaction, neglected in the band picture, is expected to become significant in this extreme quantum limit, with poorly understood consequences. Here, we present a study of the angular-dependent Nernst effect in bismuth, which establishes the existence of ultraquantum field scales on top of its complex single-particle spectrum. Each time a Landau level crosses the Fermi level, the Nernst response sharply peaks. All such peaks are resolved by the experiment, and their complex angular dependence is in very good agreement with the theory. Beyond the quantum limit, we resolve additional Nernst peaks signaling a cascade of additional Landau sublevels caused by electron interaction.

Date: 2010
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DOI: 10.1038/ncomms1039

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