Dynamics of the Kitaev-Heisenberg Model

Matthias Gohlke, Ruben Verresen, Roderich Moessner, and Frank Pollmann
Phys. Rev. Lett. 119, 157203 – Published 12 October 2017
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Abstract

We introduce a matrix-product state based method to efficiently obtain dynamical response functions for two-dimensional microscopic Hamiltonians. We apply this method to different phases of the Kitaev-Heisenberg model and identify characteristic dynamical features. In the ordered phases proximate to the spin liquid, we find significant broad high-energy features beyond spin-wave theory, which resemble those of the Kitaev model. This establishes the concept of a proximate spin liquid, which was recently invoked in the context of inelastic neutron scattering experiments on αRuCl3. Our results provide an example of a natural path for proximate spin liquid features to arise at high energies above a conventionally ordered state, as the diffuse remnants of spin-wave bands intersect to yield a broad peak at the Brillouin zone center.

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  • Received 12 January 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.157203

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Matthias Gohlke1, Ruben Verresen1,2, Roderich Moessner1, and Frank Pollmann1,2

  • 1Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany
  • 2Department of Physics, T42, Technische Universität München, 85748 Garching, Germany

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Issue

Vol. 119, Iss. 15 — 13 October 2017

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