Emptying Dirac valleys in bismuth using high magnetic fields

Zhu, Zengwei; Wang, Jinhua; Zuo, Huakun; Fauqué, Benoît; McDonald, Ross David; Fuseya, Yuki; Behnia, Kamran

doi:10.1038/ncomms15297

Title: Emptying Dirac valleys in bismuth using high magnetic fields

Journal Article · Fri May 19 00:00:00 EDT 2017 · Nature Communications

DOI:https://doi.org/10.1038/ncomms15297· OSTI ID:1361485

Zhu, Zengwei ^[1]; Wang, Jinhua ^[2]; Zuo, Huakun ^[2]; Fauqué, Benoît ^[3]; McDonald, Ross David ^[4]; Fuseya, Yuki ^[5]; Behnia, Kamran ^[6]

Huazhong Univ. of Science and Technology, Wuhan (China). Wuhan National High Magnetic Field Center and School of Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Huazhong Univ. of Science and Technology, Wuhan (China). Wuhan National High Magnetic Field Center and School of Physics
Lab. of Physics and Study of Materials (LPEM, ESPCI), Paris (France); College de France, Paris (France)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Electro-Communications, Chofu, Tokyo (Japan). Dept. of Engineering Science
Huazhong Univ. of Science and Technology, Wuhan (China). Wuhan National High Magnetic Field Center and School of Physics; Lab. of Physics and Study of Materials (LPEM, ESPCI), Paris (France)

The Fermi surface of elemental bismuth consists of three small rotationally equivalent electron pockets, offering a valley degree of freedom to charge carriers. A relatively small magnetic field can confine electrons to their lowest Landau level. This is the quantum limit attained in other dilute metals upon application of sufficiently strong magnetic field. Here in this paper we report on the observation of another threshold magnetic field never encountered before in any other solid. Above this field, B_empty, one or two valleys become totally empty. Drying up a Fermi sea by magnetic field in the Brillouin zone leads to a manyfold enhancement in electric conductance. We trace the origin of the large drop in magnetoresistance across B_empty to transfer of carriers between valleys with highly anisotropic mobilities. The non-interacting picture of electrons with field-dependent mobility explains most results but the Coulomb interaction may play a role in shaping the fine details.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396; 11574097; 2016YFA0401704; 20120772; 16K05437; 15KK0155; 15H02108

OSTI ID:: 1361485

Report Number(s):: LA-UR-17-22096

Journal Information:: Nature Communications, Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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Corrections to the magnetoresistance formula for semimetals with Dirac electrons: the Boltzmann equation approach validated by the Kubo formula Owada, Mitsuaki; Awashima, Yudai; Fuseya, Yuki Journal of Physics: Condensed Matter, Vol. 30, Issue 44 https://doi.org/10.1088/1361-648x/aae03c	journal	October 2018
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Ground-state atlas of a three-dimensional semimetal in the quantum limit Pan, Zhiming; Shindou, Ryuichi Physical Review B, Vol. 100, Issue 16 https://doi.org/10.1103/physrevb.100.165124	journal	October 2019
Metallic state in a strongly interacting spinless two-valley electron system in two dimensions Melnikov, M. Yu.; Shashkin, A. A.; Dolgopolov, V. T. Physical Review B, Vol. 101, Issue 4 https://doi.org/10.1103/physrevb.101.045302	journal	January 2020
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