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Optically Probing Quantum Materials at milliKelvin Temperatures

ORAL

Abstract

Scanning confocal microscopy offers plentiful mesoscale material information that bridges atomic-scale scanning probes and bulk characterization techniques. MilliKelvin (mK) microscopes have become indispensable tools for the description of phases and quantum critical points with critical temperatures that are inaccessible in helium cryostats. Here, we demonstrate Raman microscopy at mK on quantum paraelectric strontium titanate. Resolved TO phonon modes are consistent with the recent claim that strontium titanate is intrinsically microscopically polar. Additionally, with magneto-optical Kerr imaging, we spectrally resolve the magnetic response from yttrium iron garnet (YIG) as a step toward magneto-optical imaging at mK temperatures with YIG indicator crystals.

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Presenters

  • Yun-Yi Pai

    Materials Science and Technology Division, Oak Ridge National Laboratory, Department of Physics and Astronomy, University of Pittsburgh

Authors

  • Yun-Yi Pai

    Materials Science and Technology Division, Oak Ridge National Laboratory, Department of Physics and Astronomy, University of Pittsburgh

  • Claire Marvinney

    ORNL, Materials Science and Technology Division, Oak Ridge National Laboratory

  • Matthew Feldman

    Vanderbilt University, Department of Physics and Astronomy, Vanderbilt University

  • Chengyun Hua

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge National Lab

  • Jong-ryul Jeong

    Department of Material Science and Engineering and Graduate School of Energy Science and Technology, Chungnam National University

  • Benjamin Lawrie

    ORNL, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge National Lab