Signatures of fractionalization in the optical phonons of the hyperhoneycomb Kitaev magnet 𝛽−Li2⁢IrO3

Swarup, Swetlana; Singh, Susmita; Perkins, Natalia B.

doi:10.1103/PhysRevB.110.134421

Signatures of fractionalization in the optical phonons of the hyperhoneycomb Kitaev magnet 𝛽−Li₂⁢IrO₃

Journal Article · Fri Oct 11 00:00:00 EDT 2024 · Physical Review. B

DOI:https://doi.org/10.1103/PhysRevB.110.134421· OSTI ID:3004502

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

Univ. of Minnesota, Minneapolis, MN (United States)

Here, in this study, we propose that the signatures of spin fractionalization in quantum magnets can be identified through a detailed analysis of the temperature dependence of the asymmetric Fano lineshape of optical phonons overlapping with a continuum of spin excitations. We focus on the hyperhoneycomb magnet 𝛽−Li₂⁢IrO₃, a promising candidate for being in proximity to a three-dimensional Kitaev quantum spin liquid. The Raman response in 𝛽−Li₂⁢IrO₃ notably displays a distinctive asymmetric Fano lineshape in the 24 meV Raman-active optical phonon. This asymmetry arises from the interaction between the discrete phonon mode and the spin excitation continuum, which could be fractionalized if the material is indeed near a quantum spin-liquid phase. Our theoretical model considers the coupling of this optical phonon to Majorana fermions in the Kitaev model on the hyperhoneycomb lattice. Our findings reveal that the temperature-dependent Fano lineshape is consistent with the fractionalization of spins into Majorana fermions and ℤ_⁢2 fluxes.

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:: 3004502

Alternate ID(s):: OSTI ID: 2474008

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 13 Vol. 110; ISSN 2469-9969; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Signatures of fractionalization in the optical phonons of the hyperhoneycomb Kitaev magnet 𝛽−Li2⁢IrO3

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Signatures of fractionalization in the optical phonons of the hyperhoneycomb Kitaev magnet 𝛽−Li₂⁢IrO₃