[19a-Z19-1~12] 10.4 半導体スピントロニクス・超伝導・強相関

△ [19a-Z19-6] Influence of the quantization of the d_xy band on spin-to-charge conversion at the LaAlO₃ / SrTiO₃ interface

〇荒井 勝真¹、金田 真悟¹、Le Duc Anh¹、田中 雅明^1,2、大矢 忍^1,2 (1.東大院工、2.東大院工CSRN)

キーワード：酸化物、スピン流電流変換、二次元伝導

The recently observed various phenomena of spin-to-charge-current conversion have attracted much attention. The LaAlO₃/SrTiO₃ (LAO/STO) interface is very promising for efficient spin-to-charge conversion due to the two-dimensional electron gas (2DEG) with a large Rashba spin-orbit interaction. Previously, we achieved a large spin-to-charge conversion efficiency, the so-called inverse Edelstein length λ_IEE, up to 6.7 nm at the LAO/STO interface. In this previous work, we carried out the band-structure calculation to explain the experimental results; however, the d_xy subband was not taken into account. In this study, we have incorporated the d_xy subband into our calculation and calculated the two-dimensional current density over the spin accumulation as a function of the Fermi level. The calculated value was larger than that obtained in previous result. From this result, the experimental result is expected to be fit with this model much better than with our previous model.