Magnetic fluctuations in an XY quantum magnet CoTiO<sub>3</sub>

ORAL

Abstract

Cobalt titanate, CoTiO3 is an easy-plane quantum antiferromagnet with bond-dependent exchange couplings and it has been shown to host topological magnon modes [1, 2]. Magnetic excitations are characterized by fluctuations of phase and amplitude of the magnetic order parameter. Here we report zone center magnon modes that are detectable in both Raman and THz absorption experiments and how transverse and longitudinal magnetic fluctuations associated with these modes are manifested. We quantify the coupling between longitudinal fluctuations and transverse magnons, via analysis of asymmetric spectral line shape.

*We gratefully acknowledge the support from NSF MRSEC via grant DMR-1720595, NSF DMR-1949701, DMR-2114825, and NSF DMR-2104036.

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Publication: [1] B. Yuan, et al. Phys. Rev. X 10, 011062 (2020)
[2] M. Elliot, et al. Nat. Comm. 12, 3936 (2021)

Presenters

  • Jeongheon Choe

    • University of Texas at Austin

Authors

  • Jeongheon Choe

    • University of Texas at Austin

  • Andrey Baydin

    • Rice University

  • David Lujan

    • University of Texas at Austin

  • Gaihua Ye

    • Texas Tech University

  • Martin A Rodriguez-vega

    • Theoretical Division, Los Alamos National Laboratory
    • University of Texas at Austin
    • University of Texas at Austin, Northeastern University

  • Fuyang Tay

    • Rice University

  • Jiaming He

    • University of Texas at Austin

  • Jianshi Zhou

    • University of Texas at Austin
    • The University of Texas at Austin
    • University of Texas

  • Gregory A Fiete

    • Northeastern University
    • Northeastern University, Massachusetts Institute of Technology

  • Junichiro Kono

    • Rice University

  • Rui He

    • Texas Tech University

  • Xiaoqin Elaine Li

    • University of Texas at Austin