Non-volatile Orbital magnetoelectric effect in a two-dimensional electron gas

@misc{chen2026nonvolatile,
  title = {{Non-volatile Orbital magnetoelectric effect in a two-dimensional electron gas}},
  author = {Yu Chen and Martando Rath and Julien Brehin and Cinthia Piamonteze and Daniele Preziosi and Payal Wadhwa and Alessio Filippetti and Yuri Fukaya and Mario Cuoco and Filomena Forte and Daniela Stornaiuolo and Manuel Bibes and Marco Salluzzo},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.17073},
  eprint = {2610.17073},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.17073},
}

TY  - UNPB
TI  - Non-volatile Orbital magnetoelectric effect in a two-dimensional electron gas
AU  - Yu Chen
AU  - Martando Rath
AU  - Julien Brehin
AU  - Cinthia Piamonteze
AU  - Daniele Preziosi
AU  - Payal Wadhwa
AU  - Alessio Filippetti
AU  - Yuri Fukaya
AU  - Mario Cuoco
AU  - Filomena Forte
AU  - Daniela Stornaiuolo
AU  - Manuel Bibes
AU  - Marco Salluzzo
PY  - 2026
DA  - 2026/10/14
PB  - arXiv
DO  - 10.48550/arxiv.2610.17073
UR  - https://arxiv.org/abs/2610.17073
AB  - Electrical control of orbital magnetism is a central goal of orbitronics. While current-induced orbital polarization has recently been demonstrated in inversion-asymmetric systems, nonvolatile electrical control of an equilibrium orbital moment has remained elusive. Here, using x-ray absorption spectroscopy with \textit{in situ} electric-field control of the FE polarization, we demonstrate non-volatile switching of the equilibrium orbital magnetization of the oxide q2DEGs formed at the LaAlO_3/EuTiO_3/Ca-STO (001) interface. X-ray linear dichroism reveals a reversible modulation, driven by the FE-polarization direction, of the Ti-3d crystal-field splitting and orbital occupancy, establishing a ferroelectric-like metallic state. X-ray magnetic circular dichroism shows a polarization-controlled switching of the Eu^2+ orbital magnetic moment induced by the orbital magnetization of the q2DEG projected onto Eu-5d states and detected at the Eu-M_4,5 edge through Eu-5d/Eu-4f hybridization in the inversion-symmetry-broken interface. These results provide spectroscopic evidence of ferroelectric control of orbital magnetism in an oxide q2DEG.
ER  -