Sound attenuation in the hyperhoneycomb Kitaev spin liquid

Kexin Feng, Aysel Shiralieva, Natalia B. Perkins

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Abstract

In recent years, it has been shown that the phonon dynamics may serve as an indirect probe of fractionalization of spin degrees of freedom. Here we propose that the sound attenuation measurements allows for the characterization and identification of the Kitaev quantum spin liquid on the hyperhoneycomb lattice, which is particularly interesting since the strong Kitaev interaction was observed in the the hyperhoneycomb magnet β-Li2IrO3. To this end we consider the low-temperature scattering between acoustic phonons and gapless Majorana fermions with nodal-line band structure. We find that the sound attenuation has a characteristic angular dependence, which is explicitly shown for the high-symmetry planes at temperatures below the flux energy gap.

Original languageEnglish (US)
Article number144424
JournalPhysical Review B
Volume106
Issue number14
DOIs
StatePublished - Oct 1 2022

Bibliographical note

Funding Information:
We thank Rafael Fernandes, Gabor Halasz, and Mengxing Ye for earlier collaborations related to the topic of this study. The work of K.F. and N.B.P. was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0018056.

Publisher Copyright:
© 2022 American Physical Society.

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