Spin-charge interconversion of two-dimensional electron gases at oxide interfaces

Abstract

Oxide two-dimensional electron gas (2DEG) is a low-dimensional carrier system formed at the interface of oxide heterojunctions with strong and tunable Rashba spin-orbit coupling (SOC) which makes oxide 2DEG an ideal platform for converting spin current and charge current. This review provides a summary of the recent advances on the 2DEGs at oxide interfaces for spin-charge interconversion. On one hand, we analyze novel properties and the efficiency of the spin-to-charge conversion through different ways of spin current injection. On the other hand, the conversion of charge current to spin current under different experimental methods has been summarized. These research achievements provide perspectives and methods for understanding and regulating the spin-charge interconversion of the 2DEG at the oxide interface.

Second-order charge and spin transport in LaO/STO system in the presence of cubic Rashba spin orbit couplings

“…The LaO/STO system [11] is an archetypal example of a transition metal oxide (TMO) system and a promising candidate material for spintronics applications because of the strong SOC at its interface, which gives rise to a large (first-order) spin-to-charge conversion efficiency [12][13][14]. (A recent review on Rashba-like physics in condensed matter systems is [15], while three recent reviews on spin-charge conversion and related spin phenomena in TMO systems are [16,17], and [18]. ) Besides the usual α(k × σ) • ẑ linear Rashba SOC (RSOC) term, there is also a significant cubic-momentum RSOC at the LaO/STO interface [19][20][21].…”