APL Materials (Dec 2023)

Electronic band structure of superconducting KTaO3 (111) interfaces

  • Srijani Mallik,
  • Börge Göbel,
  • Hugo Witt,
  • Luis M. Vicente-Arche,
  • Sara Varotto,
  • Julien Bréhin,
  • Gerbold Ménard,
  • Guilhem Saïz,
  • Dyhia Tamsaout,
  • Andrés Felipe Santander-Syro,
  • Franck Fortuna,
  • François Bertran,
  • Patrick Le Fèvre,
  • Julien Rault,
  • Isabella Boventer,
  • Ingrid Mertig,
  • Agnès Barthélémy,
  • Nicolas Bergeal,
  • Annika Johansson,
  • Manuel Bibes

DOI
https://doi.org/10.1063/5.0169750
Journal volume & issue
Vol. 11, no. 12
pp. 121108 – 121108-9

Abstract

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Two-dimensional electron gases (2DEGs) based on KTaO3 are emerging as a promising platform for spin-orbitronics due to their high Rashba spin–orbit coupling (SOC) and gate-voltage tunability. The recent discovery of a superconducting state in KTaO3 2DEGs now expands their potential towards topological superconductivity. Although the band structure of KTaO3 surfaces of various crystallographic orientations has already been mapped using angle-resolved photoemission spectroscopy (ARPES), this is not the case for superconducting KTaO3 2DEGs. Here, we reveal the electronic structure of superconducting 2DEGs based on KTaO3 (111) single crystals through ARPES measurements. We fit the data with a tight-binding model and compute the associated spin textures to bring insight into the SOC-driven physics of this fascinating system.