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- W1962294441 abstract "Finite-temperature ($T$) properties of a Kitaev model defined on a honeycomb lattice are investigated by a quantum Monte Carlo simulation, from the viewpoint of fractionalization of quantum $S=1/2$ spins into two types of Majorana fermions, itinerant and localized. In this system, the entropy is released successively at two well-separated $T$ scales, as a clear indication of the thermal fractionalization. We show that the high-$T$ crossover, which is driven by itinerant Majorana fermions, is closely related with the development of nearest-neighbor spin correlations. On the other hand, the low-$T$ crossover originates in thermal fluctuations of fluxes composed of localized Majorana fermions, by which the spectrum of itinerant Majorana fermions is significantly disturbed. As a consequence, in the intermediate-$T$ range, the system exhibits coherent transport of Majorana fermions and $T$-linear behavior in the specific heat, despite the Dirac semimetallic spectrum in the low-$T$ limit. We also show that the flux fluctuations affect the gapless-gapped phase boundary. Our results indicate that the fractionalization is experimentally observable in spin correlations, specific heat, and transport properties." @default.
- W1962294441 created "2016-06-24" @default.
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- W1962294441 date "2015-04-06" @default.
- W1962294441 modified "2023-09-27" @default.
- W1962294441 title "Thermal Fractionalization of Quantum Spins in a Kitaev Model: Coherent Transport of Majorana Fermions and $T$-linear Specific Heat" @default.
- W1962294441 hasPublicationYear "2015" @default.
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