| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Helicity-dependent photoconductance of the edge states in the topological insulator Bi2Te3 |
| Yuchao Zhou(周宇超)1, Jinling Yu(俞金玲)1,†, Yonghai Chen(陈涌海)2,3, Yunfeng Lai(赖云锋)1, and Shuying Cheng(程树英)1,4 |
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 |
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Abstract The helicity-dependent photoconductance of the edge states in three-dimensional topological insulator Bi2Te3 films is investigated. It is revealed that the helicity-dependent photoconductivity current on the left edge of the Bi2Te3 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 Bi2Te3 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.
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Received: 19 January 2023
Revised: 04 March 2023
Accepted manuscript online: 14 March 2023
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PACS:
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71.70.Ej
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(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
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72.25.Fe
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(Optical creation of spin polarized carriers)
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75.70.Tj
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(Spin-orbit effects)
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75.76.+j
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(Spin transport effects)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.62074036 and 61674038) and the National Key Research and Development Program of China (Grant No.2016YFB0402303). |
Corresponding Authors:
Jinling Yu
E-mail: jlyu@semi.ac.cn
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Cite this article:
Yuchao Zhou(周宇超), Jinling Yu(俞金玲), Yonghai Chen(陈涌海), Yunfeng Lai(赖云锋), and Shuying Cheng(程树英) Helicity-dependent photoconductance of the edge states in the topological insulator Bi2Te3 2023 Chin. Phys. B 32 087102
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