@article{WOS:000615718100003,
 abstract = {We study the thermodynamic behavior of modified spin-S Kitaev models
introduced by Baskaran, Sen, and Shankar [Phys. Rev. B 78, 115116
(2008)]. These models have the property that for half-odd-integer spins
their eigenstates map on to those of spin-1/2 Kitaev models, with
well-known highly entangled quantum spin-liquid states and Majorana
fermions. For integer spins, the Hamiltonian is made out of commuting
local operators. Thus, the eigenstates can be chosen to be completely
unentangled between different sites, though with a significant
degeneracy for each eigenstate. For half-odd-integer spins, the
thermodynamic properties can be related to the spin-1/2 Kitaev models
apart from an additional degeneracy. Hence we focus here on the case of
integer spins. We use transfer matrix methods, high-temperature
expansions, and Monte Carlo simulations to study the thermodynamic
properties of ferromagnetic and antiferromagnetic models with spin S = 1
and S = 2. Apart from large residual entropies, which all the models
have, we find that they can have a variety of different behaviors.
Transfer matrix calculations show that for the different models, the
correlation lengths can be finite as T -> 0, become critical as T -> 0,
or diverge exponentially as T -> 0. The Z(2) flux variable associated
with each hexagonal plaquette saturates at the value +1 as T -> 0 in all
models except the S = 1 antiferromagnet where the mean flux remains zero
as T -> 0. We provide qualitative explanations for these results.},
 article-number = {022109},
 author = {Bradley, Owen and Oitmaa, Jaan and Sen, Diptiman and Singh, Rajiv R. P.},
 doi = {10.1103/PhysRevE.103.022109},
 eissn = {2470-0053},
 issn = {2470-0045},
 journal = {PHYSICAL REVIEW E},
 month = {FEB 5},
 number = {2},
 orcid-numbers = {Bradley, Owen/0000-0003-1303-6849},
 title = {Thermodynamic behavior of modified integer-spin Kitaev models on the
honeycomb lattice},
 unique-id = {WOS:000615718100003},
 volume = {103},
 year = {2021}
}