Low-temperature properties in the bilayer Kitaev model

Hiroyuki Tomishige, Joji Nasu, and Akihisa Koga
Phys. Rev. B 99, 174424 – Published 23 May 2019

Abstract

The ground state of the bilayer Kitaev model with the Heisenberg-type interlayer exchange interaction is investigated by means of the exact diagonalization. Calculating the ground-state energy, local quantity defined on each plaquette, and dynamical spin structure factor, we obtain results suggesting the existence of a quantum phase transition between the Kitaev quantum spin liquid (QSL) and dimer singlet states when the interlayer coupling is antiferromagnetic. On the other hand, increasing the ferromagnetic interlayer coupling, there exists no singularity in the physical quantities, suggesting that the S=1/2 Kitaev QSL state realized in each layer adiabatically connects to another QSL state realized in the S=1 Kitaev model. Thermodynamic properties are also studied by means of the thermal pure quantum state method.

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  • Received 31 January 2019
  • Revised 28 March 2019

DOI:https://doi.org/10.1103/PhysRevB.99.174424

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Hiroyuki Tomishige1, Joji Nasu1,2, and Akihisa Koga1

  • 1Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
  • 2Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan

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Issue

Vol. 99, Iss. 17 — 1 May 2019

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