Anomalous Photoelectric Effect of a Polycrystalline Topological Insulator Film

被引：76

作者：

Zhang, Hongbin ^{[1
]}

Yao, Jiandong ^{[1
]}

Shao, Jianmei ^{[1
]}

Li, Hai ^{[1
]}

Li, Shuwei ^{[1
]}

Bao, Dinghua ^{[1
]}

Wang, Chengxin ^{[1
]}

Yang, Guowei ^{[1
]}

机构：

[1] Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Inst Optoelect & Funct Composite Mat, Nanotechnol Res Ctr,Sch Phys & Engn, Guangzhou 510275, Guangdong, Peoples R China

来源：

SCIENTIFIC REPORTS | 2014年 / 4卷

基金：

中国国家自然科学基金;

关键词：

THIN-FILMS; SURFACE; BI2TE3; PHOTOCONDUCTIVITY; STATES;

D O I：

10.1038/srep05876

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：

A topological insulator represents a new state of quantum matter that possesses an insulating bulk band gap as well as a spin-momentum-locked Dirac cone on the surface that is protected by time-reversal symmetry. Photon-dressed surface states and light-induced surface photocurrents have been observed in topological insulators. Here, we report experimental observations of an anomalous photoelectric effect in thin films of Bi2Te3, a polycrystalline topological insulator. Under illumination with non-polarised light, transport measurements reveal that the resistance of the topological surface states suddenly increases when the polycrystalline film is illuminated. The resistance variation is positively dependent on the light intensity but has no relation to the applied electric field; this finding can be attributed to the gap opening of the surface Dirac cone. This observation of an anomalous photoelectric effect in polycrystalline topological insulators offers exciting opportunities for the creation of photodetectors with an unusually broad spectral range. Moreover, polycrystalline topological insulator films provide an attractive material platform for exploring the nature and practical application of topological insulators.

引用

页数：5

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