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Bulletin of the American Physical Society

Thermal Fractionalization in Kitaev Quantum Spin Liquids

Yukitoshi Motome

Published Mar 7, 2018• 0 citations
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Quantum spin liquid is a phase of matter featured with quantum entanglement and fractionalization, and it has been sought after in condensed matter. Kitaev quantum spin liquid has been of particular interest due to the emergent quasiparticles of Majorana fermion, which is proposed as a venue for quantum computations. Recently, experimental evidences for Majorana fermion have been reported in the Kitaev quantum magnet -RuCl3. Half-integer quantized thermal Hall effect and field-angle dependent Majorana gap were experimentally observed. In this article, we review physics of Kitaev quantum spin liquid and recent advances in experiments.
We identify fingerprints of a proximate quantum spin liquid (QSL), observable by finite-temperature dynamical thermal transport within a minimal version of the idealized Kitaev model on a two-leg ladder if subjected to inevitably present Heisenberg couplings. Using exact diagonalization and quantum typicality, we uncover (i) an insulator-conductor crossover induced by recombination of fractionalized excitations at small Heisenberg couplings, (ii) low- and high-energy signatures of fractionalized excitations, which survive far off the pure QSL point, and (iii) a nonmonotonous current lifetime versus Heisenberg couplings. Guided by perturbation theory, we find (iv) a Kitaev-exchange-induced ``one-magnon'' contribution to the dynamical heat transport in the strong Heisenberg rung limit.