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[理论室学术报告] Topological Insulator and Thermoelectric Effects
时间: 2015年11月24日 10:00
地点: 物理所M830会议室
报告人: Yong Xu

Department of Physics, Tsinghua University

摘要:The recent discovery of topological insulator (TI) offers new opportunities for the development of thermoelectricity, because many TIs (like Bi2Te3) are excellent thermoelectric materials. In this talk, I will first introduce our theoretical predictions of anomalous Seebeck effect and strong size effect in TI [1]. Then I will report our recent proof experiments [2, 3], which find in TI thin films that (i) the hole-type Seebeck effect and the electron-type Hall effect coexist in the same TI sample for all the measured temperatures (up to 300 K), and (ii) the thermoelectric properties depend sensitively on the film thickness. The unconventional phenomena are revealed to be closely related to the topological nature of the material. An outlook on future research will be given at the end [4, 5, 6].

References:
[1] Y. Xu et al. PRL 112, 226801 (2014).
[2] J. Zhang, X. Feng, Y. Xu et al. PRB 91, 075431 (2015).
[3] M. Guo, Z. Wang, Y. Xu et al. to be published.
[4] Y. Xu et al. PRL 111, 136804 (2013).
[5] F. Zhu, W.-J. Chen, Y. Xu et al. Nature Mater. 14, 1020 (2015).
[6] S. I. Kim et al. Science 348, 109 (2015).

个人简介
徐勇,清华大学物理系助理教授,兼任日本理化学研究所RIKEN (CEMS)课题组长。2011年获德国洪堡奖学金,2015年入选国家青年千人计划。

2001-2005清华大学物理系本科。
2005-2010清华大学高等研究院博士,导师顾秉林院士和段文晖教授。
2010-2013马普协会Fritz Haber Institute理论系博后,导师Matthias Scheffler教授。
2013-2015斯坦福大学研究学者,导师张首晟教授。

主要研究方向包括:第一性原理计算,介观体系的热输运,拓扑绝缘体与热电。

报告邀请人:翁红明 副研究员 (82649941)


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