Dimensional Crossover-Induced Topological Hall Effect in a Magnetic Topological Insulator

被引：107

作者：

Liu, Chang ^{[1
]}

Zang, Yunyi ^{[1
]}

Ruan, Wei ^{[1
]}

Gong, Yan ^{[1
]}

He, Ke ^{[1
,2
]}

Ma, Xucun ^{[1
,2
]}

Xue, Qi-Kun ^{[1
,2
]}

Wang, Yayu ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

[2] Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 17期

基金：

中国国家自然科学基金;

关键词：

DOMAIN-WALL; THIN-FILMS; SKYRMIONS; FERROMAGNETISM; STATE; ORDER; LIMIT;

D O I：

10.1103/PhysRevLett.119.176809

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report transport studies of Mn-doped Bi2Te3 topological insulator (TI) films with an accurately controlled thickness grown by molecular beam epitaxy. We find that films thicker than five quintuple layers (QLs) exhibit the usual anomalous Hall effect for magnetic TIs. When the thickness is reduced to four QLs, however, characteristic features associated with the topological Hall effect (THE) emerge. More surprisingly, the THE vanishes again when the film thickness is further reduced to three QLs. Theoretical calculations demonstrate that the coupling between the top and bottom surface states at the dimensional crossover regime stabilizes the magnetic Skyrmion structure that is responsible for the THE.

引用

页数：5

共 46 条

[1] High Fermi-level spin polarization in the (Bi1-xSbx)2Te3 family of topological insulators: A point contact Andreev reflection study [J].

Borisov, K. ;

Chang, C. -Z. ;

Moodera, J. S. ;

Stamenov, P. .

PHYSICAL REVIEW B, 2016, 94 (09)

[2] Topological Hall effect and Berry phase in magnetic nanostructures [J].

Bruno, P ;

Dugaev, VK ;

Taillefumier, M .

PHYSICAL REVIEW LETTERS, 2004, 93 (09) :096806-1

[3]

Chang CZ, 2015, NAT MATER, V14, P473, DOI [10.1038/NMAT4204, 10.1038/nmat4204]

[4] Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator [J].

Chang, Cui-Zu ;

Zhang, Jinsong ;

Feng, Xiao ;

Shen, Jie ;

Zhang, Zuocheng ;

Guo, Minghua ;

Li, Kang ;

Ou, Yunbo ;

Wei, Pang ;

Wang, Li-Li ;

Ji, Zhong-Qing ;

Feng, Yang ;

Ji, Shuaihua ;

Chen, Xi ;

Jia, Jinfeng ;

Dai, Xi ;

Fang, Zhong ;

Zhang, Shou-Cheng ;

He, Ke ;

Wang, Yayu ;

Lu, Li ;

Ma, Xu-Cun ;

Xue, Qi-Kun .

SCIENCE, 2013, 340 (6129) :167-170

[5] Thin Films of Magnetically Doped Topological Insulator with Carrier-Independent Long-Range Ferromagnetic Order [J].

Chang, Cui-Zu ;

Zhang, Jinsong ;

Liu, Minhao ;

Zhang, Zuocheng ;

Feng, Xiao ;

Li, Kang ;

Wang, Li-Li ;

Chen, Xi ;

Dai, Xi ;

Fang, Zhong ;

Qi, Xiao-Liang ;

Zhang, Shou-Cheng ;

Wang, Yayu ;

He, Ke ;

Ma, Xu-Cun ;

Xue, Qi-Kun .

ADVANCED MATERIALS, 2013, 25 (07) :1065-1070

[6]

Checkelsky JG, 2014, NAT PHYS, V10, P731, DOI [10.1038/nphys3053, 10.1038/NPHYS3053]

[7]

Checkelsky JG, 2012, NAT PHYS, V8, P729, DOI [10.1038/nphys2388, 10.1038/NPHYS2388]

[8]

DZIALOSHINSKII IE, 1957, SOV PHYS JETP-USSR, V5, P1259

[9]

Fan YB, 2014, NAT MATER, V13, P699, DOI [10.1038/nmat3973, 10.1038/NMAT3973]

[10] Skyrmions on the track [J].

Fert, Albert ;

Cros, Vincent ;

Sampaio, Joao .

NATURE NANOTECHNOLOGY, 2013, 8 (03) :152-156

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