Helicity-dependent photoconductance of the edge states in the topological insulator Bi_(2)Te_(3)  

作　　者：周宇超 俞金玲 陈涌海 赖云锋 程树英 Yuchao Zhou;Jinling Yu;Yonghai Chen;Yunfeng Lai;Shuying Cheng(Institute of Micro/Nano Devices and Solar Cells,School of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China;Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China;Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]Institute of Micro/Nano Devices and Solar Cells,School of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China [2]Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China [3]College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China [4]Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering,Changzhou University,Changzhou 213164,China

出　　处：《Chinese Physics B》2023年第8期375-381,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.62074036 and 61674038);the National Key Research and Development Program of China(Grant No.2016YFB0402303)。

摘　　要：The helicity-dependent photoconductance of the edge states in three-dimensional topological insulator Bi_(2)Te_(3)films is investigated.It is revealed that the helicity-dependent photoconductivity current on the left edge of the Bi_(2)Te_(3)film shows an opposite sign with that on the right edge.In addition,the helicity-dependent photoconductivity current increases linearly with the applied longitudinal electric field,and it reverses the sign with the reversal of the electric field.As the thickness of the Bi_(2)Te_(3)film increases,the helicity-dependent photoconductivity current also increases.Theoretical analysis suggests that the helicity-dependent photo-conductivity current may come from the intrinsic spin orbit coupling(SOC)or the SOC introduced by the chiral impurities or defects.

关 键 词：helicity-dependent photoconductance Bi_(2)Te_(3) edge states spin orbit coupling 

分 类 号：O469[理学—凝聚态物理]