講演情報
[23a-12D-10]Observation of spin-splitting state in two-dimensional hole gas at hydrogen-terminated diamond surface using circular polarized light
〇(M1)Mahiro Yamamoto1, Fujio Sako1, Ryo Ohshima1,2, Yuichiro Ando1,2,3, Naoya Morioka2,4, Hiroyuki Kawashima4, Norikazu Mizuochi2,4, Masashi Shiraishi1,2 (1.Kyoto Univ., 2.CSRN, Kyoto Univ., 3.PRESTO, JST, 4.ICR, Kyoto Univ.)
キーワード：
spin-orbit interaction、circular photogalvanic effect、diamond
Hydrogen-terminated (H-) diamond surface is a platform to create two-dimensional hole gas (2DHG) and is regarded as a Rashba system possessing a strong and tunable spin-splitting in the energy band. Whereas the spin-orbit interaction (SOI) is large in heavy metals, studying large Rashba SOI in H-diamond, which is composed of only light elements, is quite significant. In this study, we observed the spin-splitting state at 2DHG of H-diamond using circular photogalvanic effect method. The obtained photocurrent clearly shows the polarization and incident angle dependence of irradiated laser indicating the spin to charge conversion originating from the Rashba-type spin splitting state at 2DHG of H-diamond.