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arXiv · 2201.02898

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

D. Q. To·T. H. Dang·L. Vila·J. P. Attané·M. Bibes·H. Jaffrès
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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 $\boldsymbol{k.p}$ 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.

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D. Q. To, T. H. Dang, L. Vila, J. P. Attané, M. Bibes, H. Jaffrès. 2022-01-08. Spin to charge conversion at Rashba-split SrTiO$_3$ interfaces from resonant tunneling. https://doi.org/10.1103/physrevresearch.3.043170

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