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Physical Review X, volume 10, issue 3, publication number 031013

Distinct Topological Surface States on the Two Terminations of MnBi4Te7

Wu X. F. 1
Li Jiayu 1
Ma Xiao-Ming 1
Zhang Yu 1, 2
Liu Yuntian 1
Zhou Chunsheng 1
Shao Jifeng 1
Wang Qiaoming 1
Hao Yu-Jie 1
Feng Yue 1
Kumar Shiv K. 3
Sun Hong-Yi 1
Liu Peng-fei 1
shimada K. 3
Miyamoto Koji 3
Okuda T. 3
Wang Kedong 1
XIE MAOHAI 2
Chen Chao-Yu 1
Liu Qihang 1, 4
Liu Chang 1
Publication typeJournal Article
Publication date2020-07-16
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor12.5
ISSN21603308
General Physics and Astronomy
Abstract
The recent discovered intrinsic magnetic topological insulator MnBi2Te4 have been met with unusual success in hosting emergent phenomena such as the quantum anomalous Hall effect and the axion insulator states. However, the surface-bulk correspondence of the Mn-Bi-Te family, composed by the superlattice-like MnBi2Te4/(Bi2Te3)n (n = 0, 1, 2, 3 ...) layered structure, remains intriguing but elusive. Here, by using scanning tunneling microscopy (STM) and angle-resolved photoemission spectroscopy (ARPES) techniques, we unambiguously assign the two distinct surface states of MnBi4Te7 (n = 1) to the quintuple-layer (QL) Bi2Te3 termination and the septuple-layer (SL) MnBi2Te4 termination, respectively. A comparison of the experimental observations with theoretical calculations reveals the diverging topological behaviors, especially the hybridization effect between magnetic and nonmagnetic layers, on the two terminations: a gap on the QL termination originating from the topological surface states of the QL hybridizing with the bands of the beneath SL, and a gapless Dirac-cone band structure on the SL termination with time-reversal symmetry. The quasi-particle interference patterns further confirm the topological nature of the surface states for both terminations, continuing far above the Fermi energy. The QL termination carries a spin-helical Dirac state with hexagonal warping, while at the SL termination, a strongly canted helical state from the surface lies between a pair of Rashba-split states from its neighboring layer. Our work elucidates an unprecedented hybridization effect between the building blocks of the topological surface states, and also reveals the termination-dependent time-reversal symmetry breaking in a magnetic topological insulator, rendering an ideal platform to realize the half-integer quantum Hall effect and relevant quantum phenomena.

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Wu X. F. et al. Distinct Topological Surface States on the Two Terminations of MnBi4Te7 // Physical Review X. 2020. Vol. 10. No. 3. 031013
GOST all authors (up to 50) Copy
Wu X. F., Li J., Ma X., Zhang Yu., Liu Y., Zhou C., Shao J., Wang Q., Hao Y., Feng Y., Schwier E. F., Kumar S. K., Sun H., Liu P., shimada K., Miyamoto K., Okuda T., Wang K., XIE M., Chen C., Liu Q., Liu C., Zhao Y. Distinct Topological Surface States on the Two Terminations of MnBi4Te7 // Physical Review X. 2020. Vol. 10. No. 3. 031013
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TY - JOUR
DO - 10.1103/PhysRevX.10.031013
UR - https://doi.org/10.1103%2FPhysRevX.10.031013
TI - Distinct Topological Surface States on the Two Terminations of MnBi4Te7
T2 - Physical Review X
AU - Wu, X. F.
AU - Li, Jiayu
AU - Ma, Xiao-Ming
AU - Zhang, Yu
AU - Liu, Yuntian
AU - Zhou, Chunsheng
AU - Shao, Jifeng
AU - Wang, Qiaoming
AU - Hao, Yu-Jie
AU - Feng, Yue
AU - Schwier, Eike. F.
AU - Kumar, Shiv K.
AU - Sun, Hong-Yi
AU - Liu, Peng-fei
AU - shimada, K.
AU - Miyamoto, Koji
AU - Okuda, T.
AU - Wang, Kedong
AU - XIE, MAOHAI
AU - Chen, Chao-Yu
AU - Liu, Qihang
AU - Liu, Chang
AU - Zhao, Yue
PY - 2020
DA - 2020/07/16 00:00:00
PB - American Physical Society (APS)
IS - 3
VL - 10
SN - 2160-3308
ER -
BibTex
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BibTex Copy
@article{2020_Wu
author = {X. F. Wu and Jiayu Li and Xiao-Ming Ma and Yu Zhang and Yuntian Liu and Chunsheng Zhou and Jifeng Shao and Qiaoming Wang and Yu-Jie Hao and Yue Feng and Eike. F. Schwier and Shiv K. Kumar and Hong-Yi Sun and Peng-fei Liu and K. shimada and Koji Miyamoto and T. Okuda and Kedong Wang and MAOHAI XIE and Chao-Yu Chen and Qihang Liu and Chang Liu and Yue Zhao},
title = {Distinct Topological Surface States on the Two Terminations of MnBi4Te7},
journal = {Physical Review X},
year = {2020},
volume = {10},
publisher = {American Physical Society (APS)},
month = {jul},
url = {https://doi.org/10.1103%2FPhysRevX.10.031013},
number = {3},
doi = {10.1103/PhysRevX.10.031013}
}
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