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Ultraquantum magnetoresistance in the Kramers-Weyl semimetal candidate $\beta− Ag_2 Se$


Zhang, Cheng-Long; Schindler, Frank; Liu, Haiwen; Chang, Tay-Rong; Xu, Su-Yang; Chang, Guoqing; Hua, Wei; Jiang, Hua; Yuan, Zhujun; Sun, Junliang; Jeng, Horng-Tay; Lu, Hai-Zhou; Lin, Hsin; Hasan, M Zahid; Xie, X C; Neupert, Titus; Jia, Shuang (2017). Ultraquantum magnetoresistance in the Kramers-Weyl semimetal candidate $\beta− Ag_2 Se$. Physical review. B, 96:165148.

Abstract

The topological semimetal $\beta− Ag_2 Se$ features a Kramers-Weyl node at the origin in momentum space and a quadruplet of spinless Weyl nodes, which are annihilated by spin-orbit coupling. We show that single-crystalline $\beta− Ag_2 Se$ manifests giant Shubnikov–de Haas oscillations in the longitudinal magnetoresistance, which stem from a small electron pocket that can be driven beyond the quantum limit by a field less than 9 T. This small electron pocket is a remainder of the spin-orbit annihilated Weyl nodes and thus encloses a Berry-phase structure. Moreover, we observed a negative longitudinal magnetoresistance when the magnetic field is beyond the quantum limit. Our experimental findings are complemented by thorough theoretical band-structure analyses of this Kramers-Weyl semimetal candidate, including first-principles calculations and an effective $k \centerdot p$ model.

Abstract

The topological semimetal $\beta− Ag_2 Se$ features a Kramers-Weyl node at the origin in momentum space and a quadruplet of spinless Weyl nodes, which are annihilated by spin-orbit coupling. We show that single-crystalline $\beta− Ag_2 Se$ manifests giant Shubnikov–de Haas oscillations in the longitudinal magnetoresistance, which stem from a small electron pocket that can be driven beyond the quantum limit by a field less than 9 T. This small electron pocket is a remainder of the spin-orbit annihilated Weyl nodes and thus encloses a Berry-phase structure. Moreover, we observed a negative longitudinal magnetoresistance when the magnetic field is beyond the quantum limit. Our experimental findings are complemented by thorough theoretical band-structure analyses of this Kramers-Weyl semimetal candidate, including first-principles calculations and an effective $k \centerdot p$ model.

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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
Language:English
Date:2017
Deposited On:29 Dec 2017 10:04
Last Modified:21 Mar 2018 14:35
Publisher:American Physical Society
ISSN:2469-9950
OA Status:Green
Publisher DOI:https://doi.org/10.1103/PhysRevB.96.165148

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