Year: 2026
Type: article
Abstract: 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 (110) two‐dimensional electron gases to both their calculated and measured electronic band dispersions, we predict and provide experimental evidence for a significant orbital Edelstein contribution that governs the anisotropy of its harmonic transport response. 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 measurements reveal an anisotropic response that cannot be accounted for within a purely spin Edelstein framework, and is quantitatively reproduced by including an orbital contribution of order 20%. Our results establish (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.
Source: Advanced Materials
DOI: 10.1002/adma.73899
Authors: Hugo Witt, Aravind Raji, Srijani Mallik, Börge Göbel, Luis M. Vicente‐Arche, Sara Varotto, Julien Bréhin, Gerbold Ménard, Raphaël Salazar, Julien Rault, François Bertran, Patrick Le Fèvre, Isabella Boventer, Ingrid Mertig, Agnès Barthélémy, Alexandre Gloter, Annika Johansson, Nicolas Bergeal, Manuel Bibes
Institutions: Centre National de la Recherche Scientifique, Université Paris Sciences et Lettres, Université Paris-Saclay, Laboratoire de Physique et d’Étude des Matériaux, Laboratoire Albert Fert, ESPCI Paris, Laboratoire de physique des Solides, Saha Institute of Nuclear Physics, Homi Bhabha National Institute, Martin Luther University Halle-Wittenberg, Institut polytechnique de Grenoble, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Grenoble, Spintronique et Technologie des Composants, Université Paris Cité, École Normale Supérieure - PSL, Sorbonne Université, Laboratoire de Physique de l'Ecole Normale Supérieure, Synchrotron SOLEIL, University of West Bohemia in Pilsen, Institut de Physique de Rennes, Université de Rennes, Max Planck Institute of Microstructure Physics
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: G1659011215, SpIn-orbitronic QuAntum bits in Reconfigurable 2D-Oxides, Oxide quantum structures for topological devices, Superconducting KTaO3 2DEGs, Orbital Engineering for Innovative Electronics, An atomic-level platform for probing intertwined orders in correlated quantum materials, G6227504874
OpenAlex ID: W7169626405