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Article Dans Une Revue Nature Communications Année : 2022

Direct visualization of Rashba-split bands and spin/orbital-charge interconversion at KTaO3 interfaces

Raphaël Salazar
François Bertran
Patrick Le Fèvre
Julien Rault
Manuel Bibes

Résumé

Abstract Rashba interfaces have emerged as promising platforms for spin-charge interconversion through the direct and inverse Edelstein effects. Notably, oxide-based two-dimensional electron gases display a large and gate-tunable conversion efficiency, as determined by transport measurements. However, a direct visualization of the Rashba-split bands in oxide two-dimensional electron gases is lacking, which hampers an advanced understanding of their rich spin-orbit physics. Here, we investigate KTaO 3 two-dimensional electron gases and evidence their Rashba-split bands using angle resolved photoemission spectroscopy. Fitting the bands with a tight-binding Hamiltonian, we extract the effective Rashba coefficient and bring insight into the complex multiorbital nature of the band structure. Our calculations reveal unconventional spin and orbital textures, showing compensation effects from quasi-degenerate band pairs which strongly depend on in-plane anisotropy. We compute the band-resolved spin and orbital Edelstein effects, and predict interconversion efficiencies exceeding those of other oxide two-dimensional electron gases. Finally, we suggest design rules for Rashba systems to optimize spin-charge interconversion performance.

Dates et versions

hal-04208675 , version 1 (15-09-2023)

Identifiants

Citer

Sara Varotto, Annika Johansson, Börge Göbel, Luis Vicente-Arche, Srijani Mallik, et al.. Direct visualization of Rashba-split bands and spin/orbital-charge interconversion at KTaO3 interfaces. Nature Communications, 2022, 13 (1), pp.6165. ⟨10.1038/s41467-022-33621-1⟩. ⟨hal-04208675⟩
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