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arXiv · 2305.18588

Spin-Hall Current and Nonlocal Transport in Ferromagnet-Free Multi-band models for SrTiO3-Based Nanodevices in the presence of impurities

Domenico Giuliano·Andrea Nava·Carmine Antonio Perroni·Manuel Bibes·Felix Trier·Marco Salluzzo
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Abstract

We compute the spin-Hall conductance in a multiband model describing the two-dimensional electron gas formed at a LaAlO3/SrTiO3 interface in the presence of a finite concentration of impurities. Combining linear response theory with a systematic calculation of the impurity contributions to the self-energy, as well as to the vertex corrections of the relevant diagrams, we recover the full spin-Hall vs. sheet conductance dependence of LaAlO3/SrTiO3 as reported in Trier et al. [Nano Lett. 20, 395 (2020)], finding a very good agreement with the experimental data below and above the Lifshitz transition. In particular, we demonstrate that the multiband electronic structure leads to only a partial, instead of a complete, screening of the spin-Hall conductance, which decreases with increasing the carrier density. Our method can be generalized to other two-dimensional systems characterized by a broken inversion symmetry and multiband physics.

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Domenico Giuliano, Andrea Nava, Carmine Antonio Perroni, Manuel Bibes, Felix Trier, Marco Salluzzo. 2023-05-29. Spin-Hall Current and Nonlocal Transport in Ferromagnet-Free Multi-band models for SrTiO3-Based Nanodevices in the presence of impurities. https://doi.org/10.1103/physrevb.108.075418

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