Evidence for a Magnetic-Field-Induced Ideal Type-II Weyl State in Antiferromagnetic Topological Insulator
Abstract
The discovery of Weyl semimetals (WSMs) has fueled tremendous interest in condensed matter physics. The realization of WSMs requires the breaking of either inversion symmetry (IS) or time-reversal symmetry (TRS). WSMs can be categorized into type-I and type-II WSMs, which are characterized by untilted and strongly tilted Weyl cones, respectively. Type-I WSMs with breaking of either IS or TRS and type-II WSMs with solely broken IS have been realized experimentally, but a TRS-breaking type-II WSM still remains elusive. In this article, we report transport evidence for a TRS-breaking type-II WSM observed in the intrinsic antiferromagnetic topological insulator Mn(Bi1-xSbx)2Te4 under magnetic fields. This state is manifested by the electronic structure transition caused by the spin-flop transition. The transition results in an intrinsic anomalous Hall effect and negative c -axis longitudinal magnetoresistance attributable to the chiral anomaly in the ferromagnetic phases of lightly hole-doped samples. Our results establish a promising platform for exploring the underlying physics of the long-sought, ideal TRS-breaking type-II WSM.
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- Publication Date:
- Research Org.:
- Pennsylvania State Univ., University Park, PA (United States); Univ. of Arkansas, Fayetteville, AR (United States); Univ. of California, Oakland, CA (United States)
- Sponsoring Org.:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
- OSTI Identifier:
- 1812765
- Alternate Identifier(s):
- OSTI ID: 1852798
- Grant/Contract Number:
- SC0019467; SC0019064; AC02-05-CH11231; AC02-05CH11231; DMR-1539916; DM-1917579; DMR 1644779; DMR-2011839; DMR-1847811
- Resource Type:
- Published Article
- Journal Name:
- Physical Review. X
- Additional Journal Information:
- Journal Name: Physical Review. X Journal Volume: 11 Journal Issue: 3; Journal ID: ISSN 2160-3308
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; physics; anomalous Hall effect; magnetotransport; topological insulators; topological materials; topological phase transition; antiferromagnets; single crystal materials; Weyl semimetal; angle-resolved photoemissions spectroscopy; crystal growth; DC susceptibility measurements; energy spectroscopy for chemical analysis; hall bar; magnetization measurements; resistivity measurements; Shubnikov-de Haas effect; x-ray diffraction
Citation Formats
Lee, Seng Huat, Graf, David, Min, Lujin, Zhu, Yanglin, Yi, Hemian, Ciocys, Samuel, Wang, Yuanxi, Choi, Eun Sang, Basnet, Rabindra, Fereidouni, Arash, Wegner, Aaron, Zhao, Yi-Fan, Verlinde, Katrina, He, Jingyang, Redwing, Ronald, Gopalan, V., Churchill, Hugh O. H., Lanzara, Alessandra, Samarth, Nitin, Chang, Cui-Zu, Hu, Jin, and Mao, Z. Q. Evidence for a Magnetic-Field-Induced Ideal Type-II Weyl State in Antiferromagnetic Topological Insulator Mn ( Bi 1 − x Sb x ) 2 Te 4. United States: N. p., 2021.
Web. doi:10.1103/PhysRevX.11.031032.
Lee, Seng Huat, Graf, David, Min, Lujin, Zhu, Yanglin, Yi, Hemian, Ciocys, Samuel, Wang, Yuanxi, Choi, Eun Sang, Basnet, Rabindra, Fereidouni, Arash, Wegner, Aaron, Zhao, Yi-Fan, Verlinde, Katrina, He, Jingyang, Redwing, Ronald, Gopalan, V., Churchill, Hugh O. H., Lanzara, Alessandra, Samarth, Nitin, Chang, Cui-Zu, Hu, Jin, & Mao, Z. Q. Evidence for a Magnetic-Field-Induced Ideal Type-II Weyl State in Antiferromagnetic Topological Insulator Mn ( Bi 1 − x Sb x ) 2 Te 4. United States. https://doi.org/10.1103/PhysRevX.11.031032
Lee, Seng Huat, Graf, David, Min, Lujin, Zhu, Yanglin, Yi, Hemian, Ciocys, Samuel, Wang, Yuanxi, Choi, Eun Sang, Basnet, Rabindra, Fereidouni, Arash, Wegner, Aaron, Zhao, Yi-Fan, Verlinde, Katrina, He, Jingyang, Redwing, Ronald, Gopalan, V., Churchill, Hugh O. H., Lanzara, Alessandra, Samarth, Nitin, Chang, Cui-Zu, Hu, Jin, and Mao, Z. Q. Tue .
"Evidence for a Magnetic-Field-Induced Ideal Type-II Weyl State in Antiferromagnetic Topological Insulator Mn ( Bi 1 − x Sb x ) 2 Te 4". United States. https://doi.org/10.1103/PhysRevX.11.031032.
@article{osti_1812765,
title = {Evidence for a Magnetic-Field-Induced Ideal Type-II Weyl State in Antiferromagnetic Topological Insulator Mn ( Bi 1 − x Sb x ) 2 Te 4},
author = {Lee, Seng Huat and Graf, David and Min, Lujin and Zhu, Yanglin and Yi, Hemian and Ciocys, Samuel and Wang, Yuanxi and Choi, Eun Sang and Basnet, Rabindra and Fereidouni, Arash and Wegner, Aaron and Zhao, Yi-Fan and Verlinde, Katrina and He, Jingyang and Redwing, Ronald and Gopalan, V. and Churchill, Hugh O. H. and Lanzara, Alessandra and Samarth, Nitin and Chang, Cui-Zu and Hu, Jin and Mao, Z. Q.},
abstractNote = {The discovery of Weyl semimetals (WSMs) has fueled tremendous interest in condensed matter physics. The realization of WSMs requires the breaking of either inversion symmetry (IS) or time-reversal symmetry (TRS). WSMs can be categorized into type-I and type-II WSMs, which are characterized by untilted and strongly tilted Weyl cones, respectively. Type-I WSMs with breaking of either IS or TRS and type-II WSMs with solely broken IS have been realized experimentally, but a TRS-breaking type-II WSM still remains elusive. In this article, we report transport evidence for a TRS-breaking type-II WSM observed in the intrinsic antiferromagnetic topological insulator Mn(Bi1-xSbx)2Te4 under magnetic fields. This state is manifested by the electronic structure transition caused by the spin-flop transition. The transition results in an intrinsic anomalous Hall effect and negative c -axis longitudinal magnetoresistance attributable to the chiral anomaly in the ferromagnetic phases of lightly hole-doped samples. Our results establish a promising platform for exploring the underlying physics of the long-sought, ideal TRS-breaking type-II WSM.},
doi = {10.1103/PhysRevX.11.031032},
journal = {Physical Review. X},
number = 3,
volume = 11,
place = {United States},
year = {Tue Aug 10 00:00:00 EDT 2021},
month = {Tue Aug 10 00:00:00 EDT 2021}
}
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