title: Landau spectrum and twin boundaries of bismuth in the extreme quantum limit.
abstract: The Landau spectrum of bismuth is complex and includes many angle-dependent lines in the extreme quantum limit. The adequacy of single-particle theory to describe this spectrum in detail has been an open issue. Here, we present a study of angle-resolved Nernst effect in bismuth, which maps the angle-resolved Landau spectrum for the entire solid angle up to 28 T. The experimental map is in good agreement with the results of a theoretical model with parabolic dispersion for holes and an extended Dirac Hamiltonian for electrons. The angular dependence of additional lines in the Landau spectrum allows us to uncover the mystery of their origin. They correspond to the lines expected for the hole Landau levels in a secondary crystal tilted by 108°, the angle between twinned crystals in bismuth. According to our results, the electron reservoirs of the two identical tilted crystals have different chemical potentials, and carriers across the twin boundary have different concentrations. An exceptional feature of this junction is that it separates two electron-hole compensated reservoirs. The link between this edge singularity and the states wrapping a three-dimensional electron gas in the quantum limit emerges as an outstanding open question.
authors.affiliation: Laboratoire de Physique et d'Étude des Matériaux, Université Pierre et Marie Curie-Centre National de la Recherche Scientifique, Ecole Supérieure de Physique et de Chimie Industrielles, 75005 Paris, France.
authors.forename: Zengwei
authors.initials: Z
authors.lastname: Zhu
authors.forename: Benoît
authors.initials: B
authors.lastname: Fauqué
authors.forename: Liam
authors.initials: L
authors.lastname: Malone
authors.forename: Arlei Borba
authors.initials: AB
authors.lastname: Antunes
authors.forename: Yuki
authors.initials: Y
authors.lastname: Fuseya
authors.forename: Kamran
authors.initials: K
authors.lastname: Behnia
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D003461:Crystallography; D008956:Models, Chemical; D011789:Quantum Theory; D013057:Spectrum Analysis
chemical_list: D001729:Bismuth