Imaging equilibrium and non-equilibrium critical phenomena in mesoscopic magnets

ORAL

Abstract

We demonstrate a technique by which the dynamical magnetic susceptibility of a material can be measured via dephasing spectroscopy of nearby single-spin qubits. This probe measures a complementary regime of frequency and momentum compared to existing techniques, and can be applied to mesoscopic sample volumes. We use the technique to image and characterize the critical magnetic fluctuations of chromium trihalide nanoflakes near their magnetic melting temperatures. We further show how dephasing spectroscopy can be combined with external stimulus of the target material to study its critical dynamics out of equilibrium. This work can be extended to a variety of bulk materials, two-dimensional magnets, films, and devices.

*This work was supported by an appointment to the Intelligence Community Postdoctoral Research Fellowship Program at Harvard University administered by Oak Ridge Institute for Science and Education (ORISE), as well as the Office of Naval Research.

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Presenters

  • Nikola Maksimovic

    • Harvard University

Authors

  • Nikola Maksimovic

    • Harvard University

  • Ruolan Xue

    • Harvard University

  • Liqiao Xia

    • Massachusetts Institute of Technology

  • Ryota Kitagawa

    • Tokyo Institute of Technology
    • Tokyo Institute of Technology, Tokyo

  • Francisco Machado

    • ITAMP, Harvard-Smithsonian Center for Astrophysics

  • Märta Tschudin

    • University of Basel

  • Pavel Dolgirev

    • Harvard University

  • Pablo Jarillo-Herrero

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Amir Yacoby

    • Harvard University