Helicity-dependent photocurrent of the top and bottom Dirac surface states of epitaxial thin films of three-dimensional topological insulators Sb2Te3 - Details

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Abstract：

Helicity-dependent　photocurrent　(HDPC)　has　been　observed　in　epitaxial　thin　films　of　the　three-dimensional　topological　insulator　Sb2Te3　with　a　thickness　of　7,　20,　and　30　quintuple　layers　(QLs).　By　analyzing　the　incident　angle　dependence　of　the　HDPC,　we　successfully　extract　the　photocurrent　induced　by　the　circular　photon　drag　effect　(CPDE)　of　even　parity　from　the　HDPC.　It　is　found　that　the　circular　photogalvanic　effect　(CPGE)　is　larger　than　the　odd　parity　of　CPDE.　The　CPGEs　of　the　top　and　bottom　surface　states　are　successfully　distinguished　at　room　temperature.　As　the　thickness　of　the　Sb2Te3　film　is　increased　from　7　to　20　QLs,　the　dominant　contribution　of　the　CPGE　current　switches　from　the　top　surface　states　to　the　bottom　surface　states　under　the　front　illumination　of　a　1064-nm　laser.　Additionally,　it　is　found　that　the　CPGE　currents　of　the　20-　A　nd　30-QL　samples　reverse　sign　when　the　temperature　is　increased　from　77　to　300　K,　which　may　be　attributed　to　the　HDPC　current　induced　by　the　combined　action　of　the　inverse　spin　Hall　effect　and　the　vertical　thermoelectric　effect　overwhelming　the　CPGE　current　at　low　temperature　in　the　samples.　The　insights　we　obtained　are　significant　for　engineering　optospintronic　devices　based　on　three-dimensional　topological　insulators　with　a　strong　thermoelectric　effect.　©　2019　American　Physical　Society.

Keyword：

Antimony compounds Electric insulators Epitaxial growth Photocurrents Spin Hall effect Surface states Tellurium compounds Temperature Thin films Topological insulators

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[ 1 ] [Yu, Jinling]Institute of Micro/Nano Devices and Solar Cells, School of Physics and Information Engineering, Fuzhou University, Fuzhou, China
[ 2 ] [Zhu, Kejing]Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Tsinghua University, Beijing; 100084, China
[ 3 ] [Zeng, Xiaolin]Institute of Micro/Nano Devices and Solar Cells, School of Physics and Information Engineering, Fuzhou University, Fuzhou, China
[ 4 ] [Chen, Lei]Institute of Micro/Nano Devices and Solar Cells, School of Physics and Information Engineering, Fuzhou University, Fuzhou, China
[ 5 ] [Chen, Yonghai]Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
[ 6 ] [Chen, Yonghai]College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing; 100049, China
[ 7 ] [Liu, Yu]Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
[ 8 ] [Liu, Yu]College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing; 100049, China
[ 9 ] [Yin, Chunming]School of Physics, University of New South Wales, Sydney; NSW; 2052, Australia
[ 10 ] [Yin, Chunming]CAS Key Laboratory of Microscale Magnetic Resonance, Dept. of Modern Physics, Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei; 230026, China
[ 11 ] [Cheng, Shuying]Institute of Micro/Nano Devices and Solar Cells, School of Physics and Information Engineering, Fuzhou University, Fuzhou, China
[ 12 ] [Cheng, Shuying]Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou , Jiangsu; 213164, China
[ 13 ] [Lai, Yunfeng]Institute of Micro/Nano Devices and Solar Cells, School of Physics and Information Engineering, Fuzhou University, Fuzhou, China
[ 14 ] [Lai, Yunfeng]Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou , Jiangsu; 213164, China
[ 15 ] [Huang, Jin]Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou; 350002, China
[ 16 ] [He, Ke]Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Tsinghua University, Beijing; 100084, China
[ 17 ] [Xue, Qikun]Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Tsinghua University, Beijing; 100084, China

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Related Keywords：

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Source ：

Physical Review B

ISSN： 2469-9950

Year： 2019

Issue： 23

Volume： 100

3 . 5 7 5

JCR@2019

3 . 2 0 0

JCR@2023

ESI HC Threshold：138

JCR Journal Grade：2

CAS Journal Grade：3

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WoS CC Cited Count：

SCOPUS Cited Count： 25

ESI Highly Cited Papers on the List： 0 Unfold All

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30 Days PV： 0

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