Evidence for a Magnetic-Field-Induced Ideal Type-II Weyl State in Antiferromagnetic Topological Insulator Mn ( Bi 1 − x Sb x ) 2 Te 4

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.

doi:10.1103/PhysRevX.11.031032

Title: Evidence for a Magnetic-Field-Induced Ideal Type-II Weyl State in Antiferromagnetic Topological Insulator $Mn {({Bi}_{1 - x} {Sb}_{x})}_{2} {Te}_{4}$

Journal Article · Tue Aug 10 00:00:00 EDT 2021 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.11.031032· OSTI ID:1812765

;

; Yi, Hemian; Ciocys, Samuel; Wang, Yuanxi; Choi, Eun Sang; Basnet, Rabindra; Fereidouni, Arash;

; Zhao, Yi-Fan; Verlinde, Katrina; He, Jingyang; Redwing, Ronald; Gopalan, V.; Churchill, Hugh O. H.; Lanzara, Alessandra; Samarth, Nitin; Chang, Cui-Zu more »

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(Bi_1-xSb_x)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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Research Organization:: Pennsylvania State Univ., University Park, PA (United States); Univ. of Arkansas, Fayetteville, AR (United States); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)

Grant/Contract Number:: SC0019467; SC0019064; AC02-05-CH11231; AC02-05CH11231; DMR-1539916; DM-1917579; DMR 1644779; DMR-2011839; DMR-1847811

OSTI ID:: 1812765

Alternate ID(s):: OSTI ID: 1852798

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 11 Journal Issue: 3; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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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

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Title: Evidence for a Magnetic-Field-Induced Ideal Type-II Weyl State in Antiferromagnetic Topological Insulator $Mn {({Bi}_{1 - x} {Sb}_{x})}_{2} {Te}_{4}$