Vison Crystals in an Extended Kitaev Model on the Honeycomb Lattice

Shang Shun Zhang; Zhentao Wang; Gábor B. Halász; Cristian D. Batista

doi:10.1103/PhysRevLett.123.057201

Vison Crystals in an Extended Kitaev Model on the Honeycomb Lattice

Shang Shun Zhang, Zhentao Wang, Gábor B. Halász, Cristian D. Batista

Materials Theory

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28 Scopus citations

Abstract

We introduce an extension of the Kitaev honeycomb model by including four-spin interactions that preserve the local gauge structure and, hence, the integrability of the original model. The extended model has a rich phase diagram containing five distinct vison crystals, as well as a symmetric π-flux spin liquid with a Fermi surface of Majorana fermions and a sequence of Lifshitz transitions. We discuss possible experimental signatures and, in particular, present finite-temperature Monte Carlo calculations of the specific heat and the static vison structure factor. We argue that our extended model emerges naturally from generic perturbations to the Kitaev honeycomb model.

Original language	English
Article number	057201
Journal	Physical Review Letters
Volume	123
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.123.057201
State	Published - Jul 31 2019

Funding

We thank Arnab Banerjee, Hiroaki Ishizuka, and Johannes Knolle for useful comments on the manuscript. S.-S. Z., Z. W., and C. D. B. are supported by funding from the Lincoln Chair of Excellence in Physics. The work of G. B. H. at ORNL was supported by Laboratory Director’s Research and Development funds. This research used resources of the Oak Ridge Leadership Computing Facility, which is a DOE Office of Science User Facility supported under Contract No. DE-AC05-00OR22725.

Funders	Funder number
Office of Science	DE-AC05-00OR22725

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10.1103/PhysRevLett.123.057201

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abstract = "We introduce an extension of the Kitaev honeycomb model by including four-spin interactions that preserve the local gauge structure and, hence, the integrability of the original model. The extended model has a rich phase diagram containing five distinct vison crystals, as well as a symmetric π-flux spin liquid with a Fermi surface of Majorana fermions and a sequence of Lifshitz transitions. We discuss possible experimental signatures and, in particular, present finite-temperature Monte Carlo calculations of the specific heat and the static vison structure factor. We argue that our extended model emerges naturally from generic perturbations to the Kitaev honeycomb model.",

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Vison Crystals in an Extended Kitaev Model on the Honeycomb Lattice

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