Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator MnBi 2 Te 4

Hao, Yu-Jie; Liu, Pengfei; Feng, Yue; Ma, Xiao-Ming; Schwier, Eike F.; Arita, Masashi; Kumar, Shiv; Hu, Chaowei; Lu, Rui’e; Zeng, Meng; Wang, Yuan; Hao, Zhanyang; Sun, Hong-Yi; Zhang, Ke; Mei, Jiawei; Ni, Ni; Wu, Liusuo; Shimada, Kenya; Chen, Chaoyu; Liu, Qihang; Liu, Chang

doi:10.1103/PhysRevX.9.041038

Title: Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator ${MnBi}_{2} {Te}_{4}$

Journal Article · Thu Nov 21 00:00:00 EST 2019 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.9.041038· OSTI ID:1595174

; Liu, Pengfei;

; Ma, Xiao-Ming; Schwier, Eike F.; Arita, Masashi;

; Hu, Chaowei; Lu, Rui’e; Zeng, Meng;

;

; Sun, Hong-Yi; Zhang, Ke; Mei, Jiawei; Ni, Ni;

;

; Liu, Qihang more »

The recently discovered antiferromagnetic topological insulators in the Mn-Bi-Te family with intrinsic magnetic ordering have rapidly drawn broad interest since its cleaved surface state is believed to be gapped, hosting the unprecedented axion states with a half-integer quantum Hall effect. Here, however, we show unambiguously by using high-resolution angle resolved photoemission spectroscopy that a gapless Dirac cone at the (0001) surface of MnBi2Te4 exists inside the bulk band gap. Such an unexpected surface state remains unchanged across the bulk N´eel temperature, and is even robust against severe surface degradation, indicating additional topological protection. Through symmetry analysis and ab initio calculations we consider different types of surface reconstruction of the magnetic moments as possible origins giving rise to such linear dispersion. Our results unveil the experimental topological properties of MnBi2Te4, revealing that the intrinsic magnetic topological insulator hosts a rich platform to realize various topological phases by tuning the magnetic or structural configurations, and thus push forward the comprehensive understanding of magnetic topological materials.

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Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0011978; 19AG014; 19AG004; 2019B030301001; ZDSYS20170303165926217; JCYJ20150630145302240; KYTDPT20181011104202253

OSTI ID:: 1595174

Alternate ID(s):: OSTI ID: 1802300

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 9 Journal Issue: 4; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 254 works

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Title: Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator ${MnBi}_{2} {Te}_{4}$