Electronic structure changes in Ca<sub>2</sub>RuO<sub>4</sub> under DC current as observed with angle-resolved photoemission

ORAL

Abstract

The quasi-two-dimensional Mott insulator Ca2RuO4 exhibits a convergence of spin-orbit coupling and electron correlations that lead to exciting quantum phenomena, including a rare insulator-to-metal transition induced by a DC current. While structural changes have been tracked in neutron diffraction, Raman scattering, and x-ray studies, associated electronic changes have yet to be observed. We report the first angle-resolved photoemission spectroscopy (ARPES) results that track a change in the dispersion of the ruthenium t2g bands of a bulk Ca2RuO4 crystal in four-probe configuration. These results provide insight into the curious nature of the current-induced transition and advances the difficult technique of conducting photoemission while a current runs through the sample.

*This research is funded by the Max Planck-UBC-UTokyo Centre for Quantum Materials and National Sciences and Engineering Research Council of Canada. Use of Advanced Light Source (MAESTRO beamline) is supported by the U.S. Department of Energy, Office of Science User Facility under Contract No. DE-AC02-05CH11231.

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Presenters

  • Cissy Suen

    • Max Planck Institute for Solid State Research

Authors

  • Cissy Suen

    • Max Planck Institute for Solid State Research

  • Igor Markovic

    • University of British Columbia

  • Marta Zonno

    • University of British Columbia
    • Canadian Light Source

  • Sergey Zhadanovich

    • University of British Columbia

  • Sergey Gorovikov

    • Canadian Light Source
    • Canadian Lightsource

  • Aaron Bostwick

    • Lawrence Berkeley National Laboratory
    • LBNL
    • The Advanced Light Source
    • lawrence berkeley national lab
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
    • Advanced Light Source, Lawrence Berkeley National Lab

  • Eli Rotenberg

    • Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Lab

  • Bernhard Keimer

    • Max Planck Institute for Solid State Physics
    • Max Planck Institute for Solid State Research
    • Max-Planck-Institute for Solid State Research

  • Andrea Damascelli

    • University of British Columbia
    • Department of Physics and Astronomy, University of British Columbia

  • Christopher Jozwiak

    • Lawrence Berkeley National Laboratory
    • LBNL
    • The Advanced Light Source
    • lawrence berkeley national lab
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
    • Advanced Light Source, Lawrence Berkeley National Lab

  • Maxmilian Krautloher

    • Max Planck Institute for Solid State Research