Enhanced Thermoelectric Performance and Anomalous Seebeck Effects in Topological Insulators

被引：314

作者：

Xu, Yong ^{[1
,2
]}

Gan, Zhongxue ^{[2
]}

Zhang, Shou-Cheng ^{[1
,2
]}

机构：

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

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

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 22期

关键词：

SINGLE DIRAC CONE; FIGURE;

D O I：

10.1103/PhysRevLett.112.226801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Improving the thermoelectric figure of merit zT is one of the greatest challenges in material science. The recent discovery of topological insulators (TIs) offers new promise in this prospect. In this work, we demonstrate theoretically that zT is strongly size dependent in TIs, and the size parameter can be tuned to enhance zT to be significantly greater than 1. Furthermore, we show that the lifetime of the edge states in TIs is strongly energy dependent, leading to large and anomalous Seebeck effects with an opposite sign to the Hall effect. These striking properties make TIs a promising material for thermoelectric science and technology.

引用

页数：5

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