Generalized SU(3) Spin Wave Theory on Effective S=1 Triangular Lattice Magnet FeI<sub>2</sub>

ORAL

Abstract

Magnetic and quadrupolar excitations can coexist in magnetically ordered S=1 spin systems because the local Hilbert space has dimension three. By using a generalized SU(3) spin wave theory (GSWT), we uncover the hybridized nature of the low-energy modes revealed by inelastic neutron scattering (INS) measurements of the effective S=1 triangular antiferromagnet FeI2. Band crossing between dipolar and quadrupolar modes enables a large hybridization between them that is induced by symmetric exchange anisotropy. Because of this hybridization, modes with dominant quadrupolar character can be observed with INS. These modes can also be obtained from a generalized Landau-Lifshitz dynamics of SU(3) spins (3 dipolar + 5 quadrupolar components), which turns out to be the adequate dynamics for describing the low-temperature dynamical properties of FeI2.

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Presenters

  • Hao Zhang

    • Department of Physics and Astronomy, University of Tennessee, Knoxville
    • Department of Physics and Astronomy, University of Tennessee
    • Department of Physics and Astronomy, The University of Tennessee

Authors

  • Hao Zhang

    • Department of Physics and Astronomy, University of Tennessee, Knoxville
    • Department of Physics and Astronomy, University of Tennessee
    • Department of Physics and Astronomy, The University of Tennessee

  • Shang-Shun Zhang

    • Department of Physics and Astronomy, University of Tennessee, Knoxville
    • Department of Physics and Astronomy, University of Tennessee
    • University of Tennessee, Knoxville

  • Xiaojian Bai

    • Georgia Inst of Tech
    • School of Physics, Georgia Institute of Technology
    • Georgia Institute of Technology

  • Zhiling Dun

    • Georgia Inst of Tech
    • School of Physics, Georgia Institute of Technology
    • Physics, Georgia Institute of Technology
    • Georgia Institute of Technology

  • Matthew Stone

    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Quantum Condensed Matter Div, Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Spallation Neutron Source, Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Lab
    • Neutron Scattering Division, OakRidge National Laboratory

  • Alexander Kolesnikov

    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Feng Ye

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Martin Mourigal

    • Georgia Inst of Tech
    • School of Physics, Georgia Institute of Technology
    • Physics, Georgia Institute of Technology
    • Georgia Institute of Technology

  • Cristian Batista

    • Physics and Astronomy, The University of Tennessee
    • Neutron Scattering Division and Shull-Wollan Center, Oak Ridge National Laboratory
    • Department of Physics and Astronomy, The University of Tennessee
    • University of Tennessee, Knoxville
    • Department of Physics and Astronomy, University of Tennessee, Knoxville
    • Department of Physics and Astronomy, University of Tennessee