[22p-E205-1~16] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

▼ [22p-E205-2] Influence of the multi-orbital hybridizations on the spin-to-charge conversion at the LaAlO₃ / SrTiO₃ interface

〇Shoma Arai¹, Shingo Kaneta-Takada¹, Le Duc Anh¹, Masaaki Tanaka^1,2, Shinobu Ohya^1,2 (1.The Univ. of Tokyo, 2.CSRN, The Univ. of Tokyo)

Keywords:spin-to-charge conversion, Inverse Edelstein effect, oxide

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 calculated the spin-to-charge conversion efficiency, the so-called inverse Edelstein length λ_IEE, to explain the experimental result. However, the cause of peaks of the j_c^2D/δs related to spin-to-charge conversion, where j_c^2D is a two-dimensional charge-current density and δs is spin accumulation, was not clear.
In this study, we investigate the influence of the j_c^2D and δs separately. The j_c^2D originating from the d_yz band becomes large at around 85 meV, which is probably due to the enhancement of Rashba splitting by hybridization between the d_yz band and first d_xy subband. This result is expected to deepen our understanding of spin-to-charge conversion.