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Footprints of Kitaev spin liquid in the Fano lineshape of Raman-active optical phonons

Journal Article · · Physical Review. B
 [1];  [2];  [2]
  1. Univ. of Minnesota, Minneapolis, MN (United States); OSTI
  2. Univ. of Minnesota, Minneapolis, MN (United States)
+ Show Author Affiliations
We develop a theoretical description of the Raman spectroscopy in the spin-phonon-coupled Kitaev system and show that it can provide observable signatures of fractionalized excitations characteristic of the underlying spin-liquid phase. In particular, we obtain the explicit form of the phonon modes and construct the coupling Hamiltonian based on the D3d symmetry. We then systematically compute the Raman intensity and show that the spin-phonon coupling renormalizes phonon propagators and generates the salient Fano lineshape. We find that the temperature evolution of the Fano lineshape displays two crossovers, and the low-temperature crossover shows pronounced magnetic-field dependence. We thus identify the observable effect of the Majorana fermions and the Z2 gauge fluxes encoded in the Fano lineshape. Our results are consistent with the phonon Raman scattering experiments in the candidate material α-RuCl3.
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:
1979782
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 12 Vol. 105; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
Kitaev model
Quantum spin liquid
Raman spectroscopy
spin-phonon coupling