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Title: Direct visualization of Rashba-split bands and spin/orbital-charge interconversion at KTaO3 interfaces
Author(s): Varotto, Sara
Johansson, AnnikaLook up in the Integrated Authority File of the German National Library
Göbel, BörgeLook up in the Integrated Authority File of the German National Library
Vicente-Arche, Luis M.
Mallik, Srijani
Bréhin, Julien
Salazar, Raphaël
Bertran, François
Fèvre, Patrick
Bergeal, Nicolas
Rault, Julien
Mertig, IngridLook up in the Integrated Authority File of the German National Library
Bibes, Manuel
Issue Date: 2022
Type: Article
Language: English
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 KTaO3 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.
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Journal Title: Nature Communications
Publisher: Nature Publishing Group UK
Publisher Place: [London]
Volume: 13
Issue: 1
Original Publication: 10.1038/s41467-022-33621-1
Appears in Collections:Open Access Publikationen der MLU

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