Abstract
Helicity-dependent photocurrent(HDPC)of the surface states in a high-quality topological insulator(Bi0.7Sb0.3)2Te3 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(Bi0.7Sb0.3)2Te3 nanoplate is regulated by temperature,light power,excitation wavelength,the source-drain and ionic liquid top-gate volt-ages,and the regulation mechanisms are discussed.It is demonstrated that(Bi0.7Sb0.3)2Te3 nanoplates may provide a good platform for novel opto-spintronics devices.
基金项目
国家自然科学基金(62074036)
国家自然科学基金(61674038)
国家自然科学基金(11574302)
Foreign Cooperation Project of Fujian Province,China(2023I0005)
Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics(KF202108)
国家重点研发计划(2016YFB0402303)
Foundation of Fujian Provincial Department of Industry and Information Technology of China(82318075)
NETL
NSTL
万方数据