Giant nonlocal edge conduction in the axion insulator state of MnBi2Te4

Li, Yaoxin1; Liu, Chang1,2,3,4; Wang, Yongchao1; Lian, Zichen1; Li, Shuai5,6,7,8,9; Li, Hao10,11; Wu, Yang11,12; Lu, Hai-Zhou5,6,7,8,9; Zhang, Jinsong1; Wang, Yayu1,13,14

2023-06-30

10.1016/j.scib.2023.05.011

SCIENCE BULLETIN   影响因子和分区

2095-9273

2095-9281

The recently discovered antiferromagnetic (AFM) topological insulator (TI) MnBi2Te4 represents a versatile material platform for exploring exotic topological quantum phenomena in nanoscale devices. It has been proposed that even-septuple-layer (even-SL) MnBi2Te4 can host helical hinge currents with unique nonlocal behavior, but experimental confirmation is still lacking. In this work, we report transport studies of exfoliated MnBi2Te4 flakes with varied thicknesses down to the few-nanometer regime. We observe giant nonlocal transport signals in even-SL devices when the system is in the axion insulator state but vanishingly small nonlocal signal in the odd-SL devices at the same magnetic field range. In conjunction with theoretical calculations, we demonstrate that the nonlocal transport is via the helical edge currents mainly distributed at the hinges between the side and top/bottom surfaces. The helical edge currents in the axion insulator state may find unique applications in topological quantum devices.& COPY; 2023 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.

Topological insulator Axion insulator Nonlocal transport Edge state

SCI ; EI

英语

通讯

Innovation Program for Quantum Science and Technology[2021ZD0302502] ; National Key Ramp;D Program of China["2018YFA0307100","2022YFA1403700"] ; National Natural Science Foundation of China["51991340","21975140","11925402","12274453"] ; Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics[KF202204] ; Guangdong Province["2020KCXTD001","2016ZT06D348"]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:001042951900001

ELSEVIER

20232614312849

Bismuth compounds ; Electric insulators ; Manganese compounds ; Quantum theory ; Tellurium compounds ; Topology

Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Quantum Theory; Quantum Mechanics:931.4

Web of Science

1.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
2.Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China
3.Renmin Univ China, Dept Phys, Beijing Key Lab Optoelect Funct Mat & Micronano D, Beijing 100872, Peoples R China
4.Renmin Univ China, Key Lab Quantum State Construct & Manipulat, Minist Educ, Beijing 100872, Peoples R China
5.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
6.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
7.Shenzhen Key Lab Quantum Sci & Engn, Shenzhen 518055, Peoples R China
8.Quantum Sci Ctr Guangdong Hong Kong Macao Greater, Hong Kong 518045, Peoples R China
9.Int Quantum Acad, Shenzhen 518048, Peoples R China
10.Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
11.Tsinghua Univ, Tsinghua Foxconn Nanotechnol Res Ctr, Dept Phys, Beijing 100084, Peoples R China
12.Beijing Univ Chem Technol, Coll Sci, Beijing 100029, Peoples R China
13.Frontier Sci Ctr Quantum Informat, New Cornerstone Sci Lab, Beijing 100084, Peoples R China
14.Hefei Natl Lab, Hefei 230088, Peoples R China

Li, Yaoxin,Liu, Chang,Wang, Yongchao,et al. Giant nonlocal edge conduction in the axion insulator state of MnBi2Te4[J]. SCIENCE BULLETIN,2023,68(12):1252-1258.

Li, Yaoxin.,Liu, Chang.,Wang, Yongchao.,Lian, Zichen.,Li, Shuai.,...&Wang, Yayu.(2023).Giant nonlocal edge conduction in the axion insulator state of MnBi2Te4.SCIENCE BULLETIN,68(12),1252-1258.

Li, Yaoxin,et al."Giant nonlocal edge conduction in the axion insulator state of MnBi2Te4".SCIENCE BULLETIN 68.12(2023):1252-1258.