Thermodynamic evidence for valley-dependent density of states in bulk bismuth

Abstract

Electron-like carriers in bismuth are described by the Dirac Hamiltonian, with a band mass becoming a thousandth of the bare electron mass along one crystalline axis. The existence of three anisotropic valleys offers electrons an additional degree of freedom, a subject of recent attention. Here, we map the Landau spectrum by angle-resolved magnetostriction, and quantify the carrier number in each valley: while the electron valleys keep identical spectra, they substantially differ in their density of states at the Fermi level. Thus, the electron fluid does not keep the rotational symmetry of the lattice at low temperature and high magnetic field, even in the absence of internal strain. This effect, reminiscent of the Coulomb pseudo-gap in localized electronic states, affects only electrons in the immediate vicinity of the Fermi level. It presents the most striking departure from the non-interacting picture of electrons in bulk bismuth.

6 pages, 3 Figures

References in corpus (6)

• Signatures of Electron Fractionalization in Ultraquantum Bismuth
• Oscillating Nernst-Ettingshausen effect in Bismuth across the quantum limit
• Nematic Valley Ordering in Quantum Hall Systems
• Phase diagram of bismuth in the extreme quantum limit
• Landau spectrum and twin boundaries of bismuth in the extreme quantum limit
• Origin of the peaks in the Nernst coefficient of bismuth in strong magnetic fields

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• Interlayer electronic transport in CaMnBi${}_2$ antiferromagnet
• Electric field-induced valley degeneracy lifting in uniaxial strained graphene: evidence from magnetophonon resonance
• Boundary conductance in macroscopic bismuth crystals
• Spontaneous symmetry breaking of magnetostriction in metals with multi-valley band structure
• Detection of relativistic fermions in Weyl semimetal TaAs by magnetostriction measurements
• Unusual temperature evolution of band structure of Bi(111) studied by angle-resolved photoemission spectroscopy and density functional theory
• Effects of strain-tunable valleys on charge transport in bismuth
• High-field immiscibility of electrons belonging to adjacent twinned bismuth crystals
• Magnetostriction of metals with small Fermi-surface pockets: Case of the topologically trivial semimetal LuAs