RT Journal Article
T1 Anisotropic electronic structure of the 2D electron gas at the AlO_x/KTaO_3(110) interface
A1 Martínez, Emanuel Alberto
A1 Dai, Ji
A1 Tallarida, Massimo
A1 Nemes, Norbert Marcel
A1 Bruno, Flavio Yair
AB Oxide-based 2D electron gases (2DEGs) have generated significant interest due to their potential for discovering novel physical properties. Among these, 2DEGs formed in KTaO_3 stand out due to the recently discovered crystal face-dependent superconductivity and large Rashba splitting, both of which hold potential for future oxide electronics devices. In this work, angle-resolved photoemission spectroscopy is used to study the electronic structure of the 2DEG formed at the (110) surface of KTaO_3 after deposition of a thin Al layer. The experiments reveal a remarkable anisotropy in the orbital character of the electron-like dispersive bands, which form a Fermi surface consisting of two elliptical contours with their major axes perpendicular to each other. The measured electronic structure is used to constrain the modeling parameters of self-consistent tight-binding slab calculations of the band structure. In these calculations, an anisotropic Rashba splitting is found with a value as large as 4 meV at the Fermi level along the [−110] crystallographic direction. This large unconventional and anisotropic Rashba splitting is rationalized based on the orbital angular momentum formulation. These findings provide insights into the interpretation of spin-orbitronics experiments and help to constrain models for superconductivity in the KTO(110)-2DEG system.
PB Wiley
YR 2023
FD 2023-10
LK https://hdl.handle.net/20.500.14352/102962
UL https://hdl.handle.net/20.500.14352/102962
LA eng
NO 2023 Otros acuerdos transformativos de la UCM
NO Comunidad de Madrid
NO Ministerio de Ciencia e Innovación (España)
NO Agencia Estatal de Investigación (España)
NO Fondo Europeo de Desarrollo Regional (Unión Europea)
DS Docta Complutense
RD 19 abr 2025