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

Küchler, R., Steinke, L., Daou, R., Brando, M., Behnia, K., & Steglich, F. (2014). Thermodynamic evidence for valley-dependent density of states in bulk bismuth. Nature Materials, 13(5), 461-465. doi:10.1038/NMAT3909.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-9082-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-FD0F-4
Genre: Journal Article

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Küchler, R.1, Author              
Steinke, L.1, Author              
Daou, R.2, Author              
Brando, M.3, Author              
Behnia, K.4, Author
Steglich, F.5, Author              
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
3Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863469              
4External Organizations, ou_persistent22              
5Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 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(1). The existence of three anisotropic valleys offers electrons an additional degree of freedom, a subject of recent attention(2). 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 pseudogap 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.

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 Dates: 2014-05-01
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: ISI: 000334845600015
DOI: 10.1038/NMAT3909
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Title: Nature Materials
  Other : Nat. Mater.
Source Genre: Journal
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Publ. Info: London, UK : Nature Pub. Group
Pages: - Volume / Issue: 13 (5) Sequence Number: - Start / End Page: 461 - 465 Identifier: ISSN: 1476-1122
CoNE: /journals/resource/111054835734000