Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session F22: Kitaev Quantum Spin Liquids II: Progress in Theory and Experiments
8:00 AM–10:48 AM,
Tuesday, March 5, 2024
Room: 101B
Sponsoring
Unit:
GMAG
Chair: Yasir Iqbal, Indian Institute of Technology Madras
Abstract: F22.00007 : Phonon dynamics in the generalized Kitaev model with magnetic field*
9:36 AM–9:48 AM
Presenter:
susmita singh
(UNIVERSITY OF MINNESOTA)
Authors:
susmita singh
(UNIVERSITY OF MINNESOTA)
Peter Stavropoulos
(University of Minnesota)
Natalia Perkins
(University of Minnesota)
For example, experiments on the prime candidate α-RuCl3 in an in-plane magnetic field reveal an intermediate non-magnetically ordered ground state, whose nature is currently under debate. In this work we probe the effects of magnetic field on the Kitaev spin liquid state through phonon dynamics. Specifically, we study the sound attenuation and the Hall viscosity, with characteristic temperature evolution of the phonons coupled to the fermionic Majrana exctiations. We use a mean-field approach to account for the effect of the magnetic field, through the Zeeman term as well as the perturbative three-spin interaction term kappa, in the generalized J-K-Γ model pertinent to candidate materials. We obtain distinct temperature evolution of the sound attenuation expected for phonons scattering on Majorana fermions. We also find
that the phonon dynamics acquires a non-zero Hall viscosity both in the pure Kitaev and in the generalized J-K-Γ model as long as time reversal symmetry is broken.
*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0018056.
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