[17p-K102-1~12] 10.4 半導体・トポロジカル・超伝導・強相関スピントロニクス

14:15 〜 14:30英語発表

[17p-K102-4] Observation of Nonreciprocal Transport in Two-Dimensional Hole Gas at the Surface of Hydrogen-Terminated Diamond Surface

〇Fujio Sako¹, Ryo Ohshima^1,2, Yuichiro Ando³, Naoya Morioka^2,4, Hiroyuki Kawashima⁴, Riku Kawase⁴, Norikazu Mizuochi^2,4, Masashi Shiraishi^1,2 (1.Kyoto Univ., 2.CSRN, Kyoto Univ., 3.Osaka Metro. Univ., 4.ICR, Kyoto Univ.)

キーワード：

hydrogen-terminated diamond、two-dimensional hole gas、nonreciprocal transport

Hydrogen-terminated (H-) diamond hosts two-dimensional hole gas (2DHG) at its surface, and inner triangular potential at the surface gives rise to sizable Rashba-type spin splitting in the E-k dispersion. In a Rashba system, current-induced spin polarization through Edelstein effect give rise to nonreciprocal transpor tunder an external magnetic field. Longitudinal resistance R is expressed as R = R₀{1 + γB_extIsin(φ)}, where γ is a magnitude of the modulation of resistance, B_ext is extermal magnetic field, I is electric current, and φ represents the azimuthal angle of an external magnetic field to the electric current. Alternative electric current I₀sin(ωt) induces the second harmonic resistance R^2ω, which is described as R^2ω = -γB_extI₀/2. In this study, a Hall-bar shaped H-diamond (001) sample was prepared and R^2ω was measured under B_ext in φ = 90 ° direction. The odd component of R^2ω was proportional to the B_ext, which signifies successfull observation of the nonreciprocal transport.