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

Author

Listed:
  • Sara Varotto

    (Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay)

  • Annika Johansson

    (Max Planck Institute of Microstructure Physics)

  • Börge Göbel

    (Institute of Physics, Martin-Luther-Universität Halle-Wittenberg)

  • Luis M. Vicente-Arche

    (Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay)

  • Srijani Mallik

    (Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay)

  • Julien Bréhin

    (Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay)

  • Raphaël Salazar

    (Synchrotron SOLEIL, L’Orme des Merisiers)

  • François Bertran

    (Synchrotron SOLEIL, L’Orme des Merisiers)

  • Patrick Le Fèvre

    (Synchrotron SOLEIL, L’Orme des Merisiers)

  • Nicolas Bergeal

    (Laboratoire de Physique et d’Etude des Matériaux, ESPCI Paris, Université PSL, CNRS)

  • Julien Rault

    (Synchrotron SOLEIL, L’Orme des Merisiers)

  • Ingrid Mertig

    (Institute of Physics, Martin-Luther-Universität Halle-Wittenberg)

  • Manuel Bibes

    (Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay)

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.

Suggested Citation

  • Sara Varotto & Annika Johansson & Börge Göbel & Luis M. Vicente-Arche & Srijani Mallik & Julien Bréhin & Raphaël Salazar & François Bertran & Patrick Le Fèvre & Nicolas Bergeal & Julien Rault & Ingrid, 2022. "Direct visualization of Rashba-split bands and spin/orbital-charge interconversion at KTaO3 interfaces," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33621-1
    DOI: 10.1038/s41467-022-33621-1
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    References listed on IDEAS

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    1. Xu Zhang & Tongshuai Zhu & Shuai Zhang & Zhongqiang Chen & Anke Song & Chong Zhang & Rongzheng Gao & Wei Niu & Yequan Chen & Fucong Fei & Yilin Tai & Guoan Li & Binghui Ge & Wenkai Lou & Jie Shen & Ha, 2024. "Light-induced giant enhancement of nonreciprocal transport at KTaO3-based interfaces," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. B. Arnoldi & S. L. Zachritz & S. Hedwig & M. Aeschlimann & O. L. A. Monti & B. Stadtmüller, 2024. "Revealing hidden spin polarization in centrosymmetric van der Waals materials on ultrafast timescales," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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