Martínez, Emanuel AlbertoDai, JiTallarida, MassimoNemes, Norbert MarcelBruno, Flavio Yair2024-04-102024-04-102023-10Martínez EA, Dai J, Tallarida M, Nemes NM, Bruno FY. Anisotropic Electronic Structure of the 2D Electron Gas at the AlO x /KTaO3 (110) Interface. Adv Elect Materials 2023; 9: 2300267. [DOI: 10.1002/aelm.202300267]10.1002/aelm.202300267https://hdl.handle.net/20.500.14352/1029622023 Otros acuerdos transformativos de la UCMThis work has been supported by Comunidad deMadrid (Atracción de Talento grant No. 2018-T1/IND-10521 and 2022–5A/IND-24230) and by Agencia Estatal de Investigación project PID2019-105238GA-I00/AEI/10.13039/501100011033. The authors acknowledgeallocation of measurement time at ALBA under proposals 2021024953 and2022025693. LOREA was co-funded by the European Regional Develop-ment Fund (ERDF) within the Framework of the Smart Growth OperativeProgramme 2014-2020Oxide-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.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal article2199-160Xhttps://doi.org/10.1002/aelm.202300267https://onlinelibrary.wiley.com/doi/full/10.1002/aelm.202300267open access538.92DEGARPESElectronic structureKTaO_3Rashba spin–orbit couplingSurfaceSupercondutivityConductionSystemsLiquidFísica de materialesFísica del estado sólido2211 Física del Estado Sólido