Phonon dynamics in the generalized Kitaev spin liquid

Singh, Susmita; Stavropoulos, P. Peter; Perkins, Natalia B.

doi:10.1103/physrevb.107.214428

Phonon dynamics in the generalized Kitaev spin liquid

Journal Article · Fri Jun 16 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.214428· OSTI ID:2420697

Singh, Susmita ^[1]; ^[2]; ^[3]

Univ. of Minnesota, Minneapolis, MN (United States); OSTI
Univ. of Minnesota, Minneapolis, MN (United States)
Univ. of Minnesota, Minneapolis, MN (United States); Technical Univ. of Munich (Germany)

Candidate materials for the Kitaev spin liquid generically have residual interactions beyond the Kitaev coupling. It therefore becomes necessary to understand how signatures of the quantum spin liquid, e.g., fractionalization of the spin excitations, are affected by the presence of these interactions. Recently it was shown that phonon dynamics is an indirect but effective probe to study fractionalized excitations in the Kitaev spin liquid. Ultrasound experiments can measure sound attenuation, which should show characteristic temperature and angular dependence of the sound-attenuation coefficient if the scattering of phonons happens predominantly on Majorana fermions. So far the computation of the sound attenuation was only done in the pure spin-phonon coupled Kitaev model, without taking into account residual interactions. In order to understand experimental signatures, here we present a mean-field study of the sound attenuation in the generalized J-K_Γ model, which is relevant to candidate materials. Further, our findings show that as long as the system is in the spin liquid phase, characteristic features of the sound attenuation remain observable even in the presence of residual interactions.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0018056

OSTI ID:: 2420697

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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