The Japan Society of Applied Physics

2023 International Conference on Solid State Devices and Materials

2023 International Conference on Solid State Devices and Materials

2023年9月5日 〜 2023年10月31日
Nagoya Congress Center

11:15 〜 11:30

[B-4-02] Circular photogalvanic effect in spin-splitting metallic state at the surface of SrTiO 3 substrates

○Mahiro Yamamoto1,2, Taiki Nishijima1,2, Ryo Ohshima1,2, Yuichiro Ando1,2,3, Masashi Shiraishi1,2 (1. Kyoto Univ. (Japan), 2. CSRN Kyoto Univ. (Japan), 3. PRESTO (Japan))

https://doi.org/10.7567/SSDM.2023.B-4-02

The circular photogalvanic effect (CPGE) of a metallic surface state of SrTiO3 substrate is investigated. By irradiation of circular polarized light, spin accumulation is generated at the surface state. The spin accumulation is expected to be converted into a charge current, if the surface state has a finite spin splitting. A photocurrent measured between the edge of metallic states clearly shows a circular dependence of irradiated laser, indicating the spin to charge conversion originating from the Rashba-type spin splitting state of metallic surface state of SrTiO3 substrate.