Natural van der Waals heterostructural single crystals with both magnetic and topological properties

被引：241

作者：

Wu, Jiazhen ^{[1
]}

Liu, Fucai ^{[1
,2
]}

Sasase, Masato ^{[1
]}

Ienaga, Koichiro ^{[3
]}

Obata, Yukiko ^{[4
]}

Yukawa, Ryu ^{[4
]}

Horiba, Koji ^{[4
]}

Kumigashira, Hiroshi ^{[4
,5
]}

Okuma, Satoshi ^{[3
]}

Inoshita, Takeshi ^{[1
,6
]}

Hosono, Hideo ^{[1
,7
]}

机构：

[1] Tokyo Inst Technol, Mat Res Ctr Element Strategy, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan

[2] Univ Elect Sci & Technol China, Sch Optoelect Sci & Engn, Chengdu 610054, Sichuan, Peoples R China

[3] Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 Ohokayama, Tokyo 1528551, Japan

[4] High Energy Accelerator Res Org KEK, Inst Mat Struct Sci, Photon Factory & Condensed Matter Res Ctr, Tsukuba, Ibaraki 3050801, Japan

[5] Tohoku Univ, IMRAM, Sendai, Miyagi 9808577, Japan

[6] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

[7] Tokyo Inst Technol, Inst Innovat Res, Lab Mat & Struct, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan

来源：

SCIENCE ADVANCES | 2019年 / 5卷 / 11期

基金：

日本学术振兴会;

关键词：

TOTAL-ENERGY CALCULATIONS; MAGNETORESISTANCE; INSULATOR; SURFACE; COULOMB;

D O I：

10.1126/sciadv.aax9989

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Heterostructures having both magnetism and topology are promising materials for the realization of exotic topological quantum states while challenging in synthesis and engineering. Here, we report natural magnetic van der Waals heterostructures of (MnBi2Te4)(m)(Bi2Te3)(n) that exhibit controllable magnetic properties while maintaining their topological surface states. The interlayer antiferromagnetic exchange coupling is gradually weakened as the separation of magnetic layers increases, and an anomalous Hall effect that is well coupled with magnetization and shows ferromagnetic hysteresis was observed below 5 K. The obtained homogeneous heterostructure with atomically sharp interface and intrinsic magnetic properties will be an ideal platform for studying the quantum anomalous Hall effect, axion insulator states, and the topological magnetoelectric effect.

引用

页数：9

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