Phase diagram of bismuth in the extreme quantum limit

Details Phase diagram of bismuth in the extreme quantum limit Phase diagram of bismuth in the extreme quantum limit

2010-04-12

arxiv.org/abs/1004.1900v2

Nature Communications, 1:47 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1038/ncomms1039

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 sub-levels caused by electron interaction.

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