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.

*This research was sponsored by the U. S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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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