Phase transitions in intrinsic magnetic topological insulator with high-frequency pumping

Qin, Fang1,2,3,7; Chen, Rui1,4,5,7; Lu, Hai-Zhou1,6

2022-06-01

10.1088/1361-648X/ac530f

JOURNAL OF PHYSICS-CONDENSED MATTER   影响因子和分区

0953-8984

1361-648X

In this work, we investigate the topological phase transitions in an effective model for a topological thin film with high-frequency pumping. In particular, our results show that the circularly polarized light can break the time-reversal symmetry and induce the quantum anomalous Hall insulator (QAHI) phase. Meanwhile, the bulk magnetic moment can also break the time-reversal symmetry. Therefore, it shows rich phase diagram by tuning the intensity of the light and the thickness of the thin film. Using the parameters fitted by experimental data, we give the topological phase diagram of the Cr-doped Bi2Se3 thin film, showing that by modulating the strength of the polarized optical field in an experimentally accessible range, there are four different phases: the normal insulator phase, the time-reversal-symmetry-broken quantum spin Hall insulator phase, and two different QAHI phases with opposite Chern numbers. Comparing with the non-doped Bi2Se3, it is found that the interplay between the light and bulk magnetic moment separates the two different QAHI phases with opposite Chern numbers. The results show that an intrinsic magnetic topological insulator with high-frequency pumping is an ideal platform for further exploring various topological phenomena with a spontaneously broken time-reversal symmetry.

thin film topological phase transitions high-frequency pumping

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[11534001,11925402,11404106] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB28000000] ; Guangdong province["2016ZT06D348","2020KCXTD001"] ; National Key RD Program[2016YFA0301700] ; Shenzhen High-Level Special Fund["G02206304","G02206404"] ; Science, Technology and Innovation Commission of Shenzhen Municipality["ZDSYS20190902092905285","ZDSYS20170303165926217","JCYJ20170412152620376","KYTDPT20181011104202253"] ; China Postdoctoral Science Foundation["2019M662150","2020T130635","2019M661678"]

Physics

Physics, Condensed Matter

WOS:000779121900001

IOP Publishing Ltd

20221712009818

Bismuth compounds ; Chromium compounds ; Electric insulators ; Film thickness ; Magnetic moments ; Phase diagrams ; Selenium compounds ; Topological insulators ; Topology

Magnetism: Basic Concepts and Phenomena:701.2 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4

PHYSICS

Web of Science

1.Southern Univ Sci & Technol SUSTech, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen 518055, Peoples R China
3.Univ Sci & Technol China, Chinese Acad Sci, CAS Key Lab Quantum Informat, Hefei 230026, Anhui, Peoples R China
4.Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore
5.Southeast Univ, Sch Phys, Nanjing 211189, Peoples R China
6.Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Peoples R China
7.Shenzhen Key Lab Quantum Sci & Engn, Shenzhen 518055, Peoples R China

Qin, Fang,Chen, Rui,Lu, Hai-Zhou. Phase transitions in intrinsic magnetic topological insulator with high-frequency pumping[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2022,34(22).

Qin, Fang,Chen, Rui,&Lu, Hai-Zhou.(2022).Phase transitions in intrinsic magnetic topological insulator with high-frequency pumping.JOURNAL OF PHYSICS-CONDENSED MATTER,34(22).

Qin, Fang,et al."Phase transitions in intrinsic magnetic topological insulator with high-frequency pumping".JOURNAL OF PHYSICS-CONDENSED MATTER 34.22(2022).