Spin texture driven spintronic enhancement at the LaAlO3/SrTiO3 interface

Pierre Bruneel and Marc Gabay
Phys. Rev. B 102, 144407 – Published 5 October 2020

Abstract

Recent experiments have shown that transition-metal oxide heterostructures, such as SrTiO3-based interfaces, exhibit large gate-tunable spintronic responses. Our theoretical study showcases key factors controlling the magnitude of the conversion, measured by the inverse Edelstein and spin Hall effects, and their evolution with respect to an electrostatic doping. The origin of the response can be linked to spin-orbital textures. These stem from the broken inversion symmetry at the interface which produces an unusual form of the interfacial spin-orbit coupling, provided a bulk atomic spin-orbit contribution is present. The amplitudes and variations of these observables are direct consequences of the multiorbital subband structure of these materials, featuring avoided and topological crossings. Interband contributions to the coefficients lead to enhanced responses and nonmonotonic evolution with doping. We highlight these effects using analytical approaches and low-energy modeling.

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  • Received 19 May 2020
  • Accepted 14 September 2020

DOI:https://doi.org/10.1103/PhysRevB.102.144407

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Pierre Bruneel and Marc Gabay

  • Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Saclay, 91405 Orsay Cedex, France

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Issue

Vol. 102, Iss. 14 — 1 October 2020

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