Kavli Affiliate: Joel E. Moore
| First 5 Authors: Tessa Cookmeyer, Joel E. Moore, , ,
| Summary:
There have been substantial recent efforts, both experimentally and
theoretically, to find a material realization of the Kitaev spin-liquid–the
ground state of the exactly solvable Kitaev model on the honeycomb lattice.
Candidate materials are now plentiful, but the presence of non-Kitaev terms
makes comparison between theory and experiment challenging. We rederive
time-dependent Majorana mean-field theory and extend it to include quantum
phase information, allowing the direct computation of the experimentally
relevant dynamical spin-spin correlator, which reproduces exact results for the
unperturbed model. In contrast to previous work, we find that small
perturbations do not substantially alter the exact result, implying that
$alpha$-RuCl${}_3$ is perhaps farther from the Kitaev phase than originally
thought. Our approach generalizes to any correlator and to any model where
Majorana mean-field theory is a valid starting point.
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