Band structure effects of a current-induced Mott-insulator to metal transition in Ca<sub>2</sub>RuO<sub>4</sub>

ORAL

Abstract

The Mott insulator Ca2RuO4 can be turned into a metal by the application of a weak electric field and a corresponding transport current. This transition affects the optical and magnetic properties of the material. However, because of the electric field's presence and the field-induced energy broadening, it is challenging to determine the electronic structure in the metallic state by angle-resolved photoemission spectroscopy (ARPES). Making use of the recently introduced approach to enable ARPES measurements of current-carrying devices by using a nano-scale light spot [1], we are able to measure ARPES data that tracks the current-induced phase transition in Ca2RuO4 simultaneously with the electrical transport, revealing the spectral function of the current-induced state along with a potential map of the sample's surface.

[1] D. Curcio et al., Phys. Rev. Lett. 125, 236403 (2020).

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Presenters

  • Philip Hofmann

    • Aarhus University

Authors

  • Philip Hofmann

    • Aarhus University

  • Davide Curcio

    • Aarhus University

  • Alla Chikina

    • Paul Scherrer Institut
    • Aarhus University

  • Charlotte E Sanders

    • Rutherford Appleton Lab

  • Marco Bianchi

    • Aarhus University

  • Henriette E Lund

    • Aarhus University

  • Veronica Granata

    • CNR-SPIN Salerno University

  • Marco Cannavacciuolo

    • CNR-SPIN Salerno University

  • Pavel Dudin

    • Synchrotron SOLEIL

  • Jose Avila

    • Synchrotron SOLEIL

  • Craig Polley

    • MAXIV laboratory, Lund University, Sweden
    • MAX IV Laboratory, Lund University
    • MAX IV Laboratory

  • Balasubramanian Thiagarajan

    • MAXIV Laboratory, Lund University, Sweden
    • MAX IV Laboratory, Lund University
    • MAX IV Laboratory

  • Giuseppe Cuono

    • International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, PL-02668 Warsaw, Poland
    • Polish Academy of Sciences

  • Filomena Forte

    • CNR-SPIN Salerno University

  • Mario Cuoco

    • CNR-SPIN Salerno University

  • Carmine Autieri

    • International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
    • International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, PL-02668 Warsaw, Poland
    • Polish Academy of Sciences
    • International Research Centre MagTop

  • Antonio Vecchione

    • CNR-SPIN Salerno University