B<sub>1g</sub> Raman response near an Ising-nematic quantum critical point: properties of a quasielastic peak

ORAL

Abstract

Raman scattering has long been used to probe dynamical electronic correlations in various condensed matter systems. Here we present a theoretical study of the B1g channel Raman response in the vicinity of an Ising-nematic quantum critical point (QCP) in two space dimensions. We show the appearance of a “quasi-elastic peak” as the QCP is approached. The peak frequency is related to the relaxation rate of the deformation of the Fermi surface in the angular momentum l=2 channel, while the peak intensity is directly proportional to the Ising-nematic thermodynamic susceptibility. We discuss our results in the context of iron selenide materials which host such a quantum critical point.

*XW acknowledge support from National MagLab, which is funded by the National Science Foundation (DMR-1644779) and the state of Florida making all taxpayers stakeholders in our science.

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Presenters

  • Xiaoyu Wang

    • National High Magnetic Field Laboratory, Florida State University
    • Natl High Magnetic Field Lab
    • National High Magnetic Field Laboratory

Authors

  • Xiaoyu Wang

    • National High Magnetic Field Laboratory, Florida State University
    • Natl High Magnetic Field Lab
    • National High Magnetic Field Laboratory

  • Erez Berg

    • Weizmann Institute of Science
    • Department of Physics, Weizmann Intitute of Science