Orbital and Spin Edelstein Effects in KTaO3(110) Two-Dimensional Electron Gases
Abstract
The orbital Edelstein effect converts an electric field into a non-equilibrium orbital polarization, opening new opportunities for orbitronics. Although signatures of the orbital Edelstein effect have been reported, its microscopic mechanisms and quantitative validation remain underexplored. Here, by directly linking the atomic structure of KTaO3(110) two-dimensional electron gases to both their calculated and measured electronic band dispersions, we predict and provide experimental evidence for an orbital Edelstein effect that largely counterbalances its spin counterpart. Scanning transmission electron microscopy and electron energy-loss spectroscopy resolve the interfacial atomic configuration, which is used as input for density-functional calculations. Angle-resolved photoemission spectroscopy then confirms the resulting band structure, which is fitted by a tight-binding model enabling computation of the spin and orbital Edelstein responses. Harmonic magnetotransport indicates that a ∼20 \% contribution from the orbital Edelstein response is necessary to describe the magnitude and anisotropy of the effect. Our results establish KTaO3(110) as a model platform for orbitronics and demonstrate a pathway to generate and harness orbital polarization in quantum oxide systems while also offering new insights into pairing mechanisms in their superconducting state.
Versions
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BibTeX
@misc{witt2026orbital,
title = {{Orbital and Spin Edelstein Effects in KTaO$_3$(110) Two-Dimensional Electron Gases}},
author = {Hugo Witt and Aravind Raji and Srijani Mallik and Börge Göbel and Luis M. Vicente-Arche and Sara Varotto and Julien Bréhin and Gerbold Ménard and Raphaël Salazar and Julien Rault and François Bertran and Patrick Le Fèvre and Isabella Boventer and Ingrid Mertig and Agnès Barthélémy and Alexandre Gloter and Annika Johansson and Nicolas Bergeal and Manuel Bibes},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.31051},
eprint = {2608.31051},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.31051},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Orbital and Spin Edelstein Effects in KTaO_3(110) Two-Dimensional Electron Gases
AU - Hugo Witt
AU - Aravind Raji
AU - Srijani Mallik
AU - Börge Göbel
AU - Luis M. Vicente-Arche
AU - Sara Varotto
AU - Julien Bréhin
AU - Gerbold Ménard
AU - Raphaël Salazar
AU - Julien Rault
AU - François Bertran
AU - Patrick Le Fèvre
AU - Isabella Boventer
AU - Ingrid Mertig
AU - Agnès Barthélémy
AU - Alexandre Gloter
AU - Annika Johansson
AU - Nicolas Bergeal
AU - Manuel Bibes
PY - 2026
DA - 2026/08/31
PB - arXiv
DO - 10.48550/arxiv.2608.31051
UR - https://arxiv.org/abs/2608.31051
AB - The orbital Edelstein effect converts an electric field into a non-equilibrium orbital polarization, opening new opportunities for orbitronics. Although signatures of the orbital Edelstein effect have been reported, its microscopic mechanisms and quantitative validation remain underexplored. Here, by directly linking the atomic structure of KTaO_3(110) two-dimensional electron gases to both their calculated and measured electronic band dispersions, we predict and provide experimental evidence for an orbital Edelstein effect that largely counterbalances its spin counterpart. Scanning transmission electron microscopy and electron energy-loss spectroscopy resolve the interfacial atomic configuration, which is used as input for density-functional calculations. Angle-resolved photoemission spectroscopy then confirms the resulting band structure, which is fitted by a tight-binding model enabling computation of the spin and orbital Edelstein responses. Harmonic magnetotransport indicates that a ∼20 \% contribution from the orbital Edelstein response is necessary to describe the magnitude and anisotropy of the effect. Our results establish KTaO_3(110) as a model platform for orbitronics and demonstrate a pathway to generate and harness orbital polarization in quantum oxide systems while also offering new insights into pairing mechanisms in their superconducting state.
ER -