Investigation of helicity-dependent photocurrent of surface states in(Bi$_{\bf 0.7}$Sb$_{\bf 0.3}$)$_{\bf 2}$Te$_{\bf 3}$ nanoplate

doi:10.1088/1674-1056/ad322c

Abstract Helicity-dependent photocurrent (HDPC) of the surface states in a high-quality topological insulator (Bi$_{0.7}$Sb$_{0.3}$)$_2$Te$_3$ nanoplate grown by chemical vapor deposition (CVD) is investigated. By investigating the angle-dependent HDPC, it is found that the HDPC is mainly contributed by the circular photogalvanic effect (CPGE) current when the incident plane is perpendicular to the connection of the two contacts, whereas the circular photon drag effect (CPDE) dominates the HDPC when the incident plane is parallel to the connection of the two contacts. In addition, the CPGE of the (Bi$_{0.7}$Sb$_{0.3}$)$_2$Te$_3$ nanoplate is regulated by temperature, light power, excitation wavelength, the source-drain and ionic liquid top-gate voltages, and the regulation mechanisms are discussed. It is demonstrated that (Bi$_{0.7}$Sb$_{0.3}$)$_2$Te$_3$ nanoplates may provide a good platform for novel opto-spintronics devices.

Keywords: (Bi$_{0.7}$Sb$_{0.3}$)$_{2}$Te$_{3}$ nanoplate helicity-dependent photocurrent circular photogalvanic effect ionic liquid gating

Received: 07 January 2024
Revised: 17 February 2024
Accepted manuscript online:

PACS:	71.70.Ej	(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
	72.25.Fe	(Optical creation of spin polarized carriers)
	75.70.Tj	(Spin-orbit effects)
	75.76.+j	(Spin transport effects)

Fund: Project supported by the National Natural ScienceFoundation of China (Grant Nos. 62074036, 61674038,and 11574302), the Foreign Cooperation Project of Fujian Province, China (Grant No. 2023I0005), the Open Research Fund Program of the State Key Laboratory of LowDimensional Quantum Physics (Grant No. KF202108), theNational Key Research and Development Program of China(Grant No. 2016YFB0402303), and the Foundation of FujianProvincial Department of Industry and Information Technology of China (Grant No. 82318075).

Corresponding Authors: Jinling Yu,E-mail:jlyu@semi.ac.cn
E-mail: jlyu@semi.ac.cn

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Qin Yu(喻钦), Jinling Yu(俞金玲), Yonghai Chen(陈涌海), Yunfeng Lai(赖云锋), Shuying Cheng(程树英), and Ke He(何珂) Investigation of helicity-dependent photocurrent of surface states in(Bi$_{\bf 0.7}$Sb$_{\bf 0.3}$)$_{\bf 2}$Te$_{\bf 3}$ nanoplate 2024 Chin. Phys. B 33 057101

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Investigation of helicity-dependent photocurrent of surface states in(Bi$_{\bf 0.7}$Sb$_{\bf 0.3}$)$_{\bf 2}$Te$_{\bf 3}$ nanoplate

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