Magnetic field dependence of second-harmonic generation in Sr2IrO4

ORAL

Abstract

An anomalous optical second-harmonic generation (SHG) signal was previously reported in Sr2IrO4 and attributed to a hidden odd-parity bulk magnetic state. We investigated the SHG signal using magnetic-field-dependent SHG rotational anisotropy and wide-field SHG imaging combined with atomic force microscopy. We observe a two-fold rotational symmetry of the anomalous SHG signal as a function of in-plane magnetic field orientation that is associated with a crystallographic distortion. We also show a change in SHG signal across step edges that tracks the bulk antiferromagnetic stacking pattern. We will discuss the implications of these results for the origin of the anomalous SHG signal.

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Presenters

  • Kyle Seyler

    • Caltech

Authors

  • Kyle Seyler

    • Caltech

  • Alberto De La Torre

    • Brown University
    • California Institute of Technology
    • Caltech

  • Zach Porter

    • University of California, Santa Barbara

  • Eli A Zoghlin

    • University of California, Santa Barbara

  • Robert Polski

    • Caltech
    • Watson Laboratory of Applied Physics, California Institute of Technology
    • Physics, California Institute of Technology

  • Mai Nguyen

    • Caltech

  • Stevan Nadj-Perge

    • Caltech
    • Watson Laboratory of Applied Physics, California Institute of Technology
    • Physics, California Institute of Technology

  • Stephen D Wilson

    • University of California, Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • California NanoSystems Institute, University of California, Santa Barbara

  • David Hsieh

    • Department of Physics, California Institute of Technology
    • California Institute of Technology
    • Caltech
    • Physics, California Institute of Technology