Spin-to-charge conversion at KTaO3(111) interfaces

TL;DR

This paper demonstrates spin-to-charge conversion at KTaO3(111) interfaces, revealing the role of Rashba spin-orbit coupling and complex spin textures, with potential applications in probing electronic structures.

Contribution

It provides the first experimental demonstration of inverse Rashba-Edelstein effect at KTaO3(111) interfaces and analyzes the spin texture and electronic structure in detail.

Findings

Spin-to-charge conversion observed at KTaO3(111) interfaces.

Angle dependence of conversion matches Fermi state symmetry.

Results suggest new ways to probe electronic and spin structures.

Abstract

Rashba spin-orbit coupling locks the spin with momentum of charge carriers at the broken inversion interfaces, which could generate a large spin galvanic response. Here, we demonstrate spin-to-charge conversion (inverse Rashba-Edelstein effect) in KTaO3(111) two-dimensional electron systems. We explain the results in the context of electronic structure, orbital character, and spin texture at the KTaO3(111) interfaces. We also show that the angle dependence of the spin-to-charge conversion on in-plane magnetic field exhibits a nontrivial behavior which matches the symmetry of the Fermi states. Results point to opportunities to use spin-to-charge conversion as a tool to investigate the electronic structure and spin texture.