Spin to charge conversion at Rashba-split SrTiO${}_3$ interfaces from resonant tunneling

Abstract

Spin-charge interconversion is a very active direction in spintronics. Yet, the complex behaviour of some of the most promising systems such as SrTiO${}_3$ (STO) interfaces is not fully understood. Here, on the basis of a 6-band $\mathbf{k}.\mathbf{p}$ method combined with spin-resolved scattering theory, we give a theoretical demonstration of transverse spin-charge interconversion physics in STO Rashba interfaces. Calculations involve injection of spin current from a ferromagnetic contact by resonant tunneling into the native Rashba-split resonant levels of the STO triangular quantum well. We compute an asymmetric tunneling electronic transmission yielding a transverse charge current flowing in plane, with a dependence with gate voltage in a very good agreement with existing experimental data.

21 pages, 6 figures

References in corpus (7)

• Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Ultrafast spin-currents and charge conversion at 3d-5d interfaces probed by time-domain terahertz spectroscopy
• Determining the Rashba parameter from the bilinear magnetoresistance response in a two-dimensional electron gas
• Theory of the spin galvanic effect at oxide interfaces
• Tunable spin and orbital polarization in SrTiO3-based heterostructures
• Evidence of Pure Spin-Current Generated by Spin Pumping in Interface Localized States in Hybrid Metal-Silicon-Metal Vertical Structures