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Theory for the negative longitudinal magnetoresistance in the quantum limit of Kramers Weyl semimetals


Wan, Bo; Schindler, Frank; Wang, Ke; Wu, Kai; Wan, Xiangang; Neupert, Titus; Lu, Hai-Zhou (2018). Theory for the negative longitudinal magnetoresistance in the quantum limit of Kramers Weyl semimetals. Journal of Physics: Condensed Matter, 30(50):505501.

Abstract

Negative magnetoresistance is rare in non-magnetic materials. Recently, negative magnetoresistance has been observed in the quantum limit of β-Ag2Se, where only one band of Landau levels is occupied in a strong magnetic field parallel to the applied current. β-Ag2Se is a material that hosts a Kramers Weyl cone with band degeneracy near the Fermi energy. Kramers Weyl cones exist at time-reversal invariant momenta in all symmorphic chiral crystals, and at a subset of these momenta, including the Γ point, in non-symmorphic chiral crystals. Here, we present a theory for the negative magnetoresistance in the quantum limit of Kramers Weyl semimetals. We show that, although there is a band touching similar to those in Weyl semimetals, negative magnetoresistance can exist without a chiral anomaly. We find that it requires screened Coulomb scattering potentials between electrons and impurities, which is naturally the case in β-Ag2Se.

Abstract

Negative magnetoresistance is rare in non-magnetic materials. Recently, negative magnetoresistance has been observed in the quantum limit of β-Ag2Se, where only one band of Landau levels is occupied in a strong magnetic field parallel to the applied current. β-Ag2Se is a material that hosts a Kramers Weyl cone with band degeneracy near the Fermi energy. Kramers Weyl cones exist at time-reversal invariant momenta in all symmorphic chiral crystals, and at a subset of these momenta, including the Γ point, in non-symmorphic chiral crystals. Here, we present a theory for the negative magnetoresistance in the quantum limit of Kramers Weyl semimetals. We show that, although there is a band touching similar to those in Weyl semimetals, negative magnetoresistance can exist without a chiral anomaly. We find that it requires screened Coulomb scattering potentials between electrons and impurities, which is naturally the case in β-Ag2Se.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:General Materials Science, Condensed Matter Physics
Language:English
Date:19 December 2018
Deposited On:16 Jan 2019 16:18
Last Modified:25 Sep 2019 00:05
Publisher:IOP Publishing
ISSN:0953-8984
OA Status:Green
Publisher DOI:https://doi.org/10.1088/1361-648x/aaebed
Project Information:
  • : FunderSNSF
  • : Grant ID200021_169061
  • : Project TitleAnyons in topological matter: From axiomatic field theory to advanced materials

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