Electronic band structure of superconducting KTaO3 (111) interfaces.

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. [ABSTRACT FROM AUTHOR]