Javier E. Villegas
(Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay)
We demonstrate, through experiments (transport, electron microscopy & spectroscopy) and density functional theory (DFT), that a high mobility 2DEG can be optically switched on and off at a correlated oxides interface where such an electronic state does not naturally exist [1]. In particular, we find that near-ultraviolet light instantly creates a volatile 2DEG at the interface between SrTiO3 (a band insulator) and infinite-layer NdNiO2 (a poor metal), resulting in a conductivity increase of up to five orders of magnitude. This dramatic stems from structural and electronic reconstruction that, along with a built-in interfacial electric field, facilitates the Ti-3d band occupation by photogenerated carriers. These findings open avenues for engineering photoconductance in strongly correlated <systems.
Work supported by EIC Parthfinder “JOSEPHINE”
[1] Sanchez-Manzano et al. , Nature Materials 25, 49–57 (2026) https://doi.org/10.1038/s41563-025-02363-y
D. Sanchez-Manzano
(1Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, France)
G. Krieger
(Institute of Physics and Chemistry of Materials of Strasbourg, CNRS, University of Strasbourg, France)
A. Raji
(Institute of Physics and Chemistry of Materials of Strasbourg, CNRS, University of Strasbourg, France)
B. Geisler
(Department of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Germany)
V. Humbert
(Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay)
H. Jaffres
(Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay)
J. Santamaria
(Departamento de Física de Materiales, Universidad Complutense de Madrid, Spain)
R. Pentcheva
(Department of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Germany)
Dr
A. Gloter
(Laboratoire de Physique de Solides, CNRS, Université Paris-Saclay, France)
D. Preziosi
(Institute of Physics and Chemistry of Materials of Strasbourg, CNRS, University of Strasbourg, France)
Javier E. Villegas
(Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay)
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