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Magnetic field dependence of second-harmonic generation in Sr<sub>2</sub>IrO<sub>4</sub>

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