Ultraquantum magnetoresistance in the Kramers-Weyl semimetal candidate β-Ag2Se

Cheng Long Zhang; Frank Schindler; Haiwen Liu; Tay Rong Chang; Su Yang Xu; Guoqing Chang; Wei Hua; Hua Jiang; Zhujun Yuan; Junliang Sun; Horng Tay Jeng; Hai Zhou Lu; Hsin Lin; M. Zahid Hasan; X. C. Xie; Titus Neupert; Shuang Jia

doi:10.1103/PhysRevB.96.165148

Ultraquantum magnetoresistance in the Kramers-Weyl semimetal candidate β-Ag2Se

Cheng Long Zhang, Frank Schindler, Haiwen Liu, Tay Rong Chang, Su Yang Xu, Guoqing Chang, Wei Hua, Hua Jiang, Zhujun Yuan, Junliang Sun, Horng Tay Jeng, Hai Zhou Lu, Hsin Lin, M. Zahid Hasan, X. C. Xie, Titus Neupert, Shuang Jia

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Abstract

The topological semimetal β-Ag2Se 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 β-Ag2Se 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·p model.

Original language	English (US)
Article number	165148
Journal	Physical Review B
Volume	96
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.96.165148
State	Published - Oct 26 2017

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.96.165148

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title = "Ultraquantum magnetoresistance in the Kramers-Weyl semimetal candidate β-Ag2Se",

abstract = "The topological semimetal β-Ag2Se 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 β-Ag2Se 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·p model.",

author = "Zhang, {Cheng Long} and Frank Schindler and Haiwen Liu and Chang, {Tay Rong} and Xu, {Su Yang} and Guoqing Chang and Wei Hua and Hua Jiang and Zhujun Yuan and Junliang Sun and Jeng, {Horng Tay} and Lu, {Hai Zhou} and Hsin Lin and Hasan, {M. Zahid} and Xie, {X. C.} and Titus Neupert and Shuang Jia",

note = "Funding Information: The authors thank J. Xiong, C. Fang, and F. Wang for helpful discussion, and K. Liu for assistance with TEM measurements. The authors thank J. Wang and Y. Li for using their instruments. S.J. is supported by National Basic Research Program of China (Grant No. 2014CB239302) and National Natural Science Foundation of China (Grant No. 11774007). F.S. acknowledges support from the Swiss National Science Foundation. C.-L.Z. thanks S.-F. Fan for inspiration. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

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doi = "10.1103/PhysRevB.96.165148",

language = "English (US)",

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AU - Zhang, Cheng Long

AU - Schindler, Frank

AU - Liu, Haiwen

AU - Chang, Tay Rong

AU - Xu, Su Yang

AU - Chang, Guoqing

AU - Hua, Wei

AU - Jiang, Hua

AU - Yuan, Zhujun

AU - Sun, Junliang

AU - Jeng, Horng Tay

AU - Lu, Hai Zhou

AU - Lin, Hsin

AU - Hasan, M. Zahid

AU - Xie, X. C.

AU - Neupert, Titus

AU - Jia, Shuang

N1 - Funding Information: The authors thank J. Xiong, C. Fang, and F. Wang for helpful discussion, and K. Liu for assistance with TEM measurements. The authors thank J. Wang and Y. Li for using their instruments. S.J. is supported by National Basic Research Program of China (Grant No. 2014CB239302) and National Natural Science Foundation of China (Grant No. 11774007). F.S. acknowledges support from the Swiss National Science Foundation. C.-L.Z. thanks S.-F. Fan for inspiration. Publisher Copyright: © 2017 American Physical Society.

PY - 2017/10/26

Y1 - 2017/10/26

N2 - The topological semimetal β-Ag2Se 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 β-Ag2Se 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·p model.

AB - The topological semimetal β-Ag2Se 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 β-Ag2Se 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·p model.

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Ultraquantum magnetoresistance in the Kramers-Weyl semimetal candidate β-Ag2Se

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