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Spin liquid fingerprints in the thermal transport of a Kitaev-Heisenberg ladder

Alexandros Metavitsiadis1,*, Christina Psaroudaki2,†, and Wolfram Brenig1,‡

  • 1Institute for Theoretical Physics, Technical University Braunschweig, D-38106 Braunschweig, Germany
  • 2Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

  • *a.metavitsiadis@tu-bs.de
  • christina.psaroudaki@unibas.ch
  • w.brenig@tu-bs.de

Phys. Rev. B 99, 205129 – Published 17 May, 2019

DOI: https://doi.org/10.1103/PhysRevB.99.205129

Abstract

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.

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