Dynamics of New and Old Triangular Antiferromagnets

ORAL · Invited

Abstract

The dynamics of magnets stems from magnetic excitations above the ground state, yielding crucial insights into the microscopic mechanisms governing a material's physical properties. Our presentation centers on an old member of the antiferromagnetic family on triangular lattices from the 1970s. This member has garnered renewed attention in recent years, thanks to cutting-edge experimental instruments that allow high-precision measurement of its dynamics. Furthermore, this member reveals intriguing quantum effects, encompassing energy spectrum renormalization, quasiparticle instability, and the emergence of higher-order bound states, etc.. To elucidate these phenomena, we present theoretical methods designed to provide a comprehensive physical picture and a quantitative description. Significantly, the theoretical calculations successfully account for several recent experimental findings.

* We thank the support from Lincoln Chair of Excellence in Physics, U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under award DE-SC-0018660, DOE BES under DE-SC0019331.

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Presenters

  • Shang-Shun Zhang

    University of Minnesota

Authors

  • Shang-Shun Zhang

    University of Minnesota

  • Xiaojian Bai

    Louisiana State University

  • Hao Zhang

    LANL, Los Alamos National Laboratory

  • Anaelle Legros

    Johns Hopkins University

  • Cristian D Batista

    University of Tennessee

  • Martin P Mourigal

    Georgia Tech, Georgia Institute of Technology

  • Peter N Armitage

    Johns Hopkins University

  • Zhiling Dun

    Georgia Institute of Technology

  • William A Phelan

    Los Alamos National Laboratory (LANL)

  • Ovidiu O Garlea

    Oak Ridge National Lab, Oak Ridge National Laboratory, ORNL