Disentangling the magnetoelectric and thermoelectric transport in topological insulator thin films

被引：43

作者：

Zhang, Jinsong ^{[1
]}

Feng, Xiao ^{[1
,2
]}

Xu, Yong ^{[3
,4
]}

Guo, Minghua ^{[1
]}

Zhang, Zuocheng ^{[1
]}

Ou, Yunbo ^{[2
]}

Feng, Yang ^{[1
]}

Li, Kang ^{[2
]}

Zhang, Haijun ^{[3
]}

Wang, Lili ^{[1
,5
]}

Chen, Xi ^{[1
,5
]}

Gan, Zhongxue ^{[4
]}

Zhang, Shou-Cheng ^{[3
,4
]}

He, Ke ^{[1
,5
]}

Ma, Xucun ^{[1
,5
]}

Xue, Qi-Kun ^{[1
,5
]}

Wang, Yayu ^{[1
,5
]}

机构：

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

[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[3] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[4] ENN Intelligent Energy Grp, Langfang 065001, Hebei, Peoples R China

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

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 07期

基金：

中国国家自然科学基金;

关键词：

SINGLE DIRAC CONE; PERFORMANCE; DISTORTION; BI2SE3; POWER;

D O I：

10.1103/PhysRevB.91.075431

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report transport studies on (Bi1-x Sb-x)(2)Te-3 topological insulator thin films with tunable electronic band structure. We find a doping and temperature regime in which the Hall coefficient is negative indicative of electron-type carriers, whereas the Seebeck coefficient is positive indicative of hole-type carriers. This sign anomaly is due to the distinct transport behaviors of the bulk and surface states: the surface Dirac fermions dominate magnetoelectric transport while the thermoelectric effect is mainly determined by the bulk states. These findings may inspire new ideas for designing topological insulator-based high-efficiency thermoelectric devices.

引用

页数：7

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