Chiral bosonic topological insulator on the honeycomb lattice with anisotropic interactions

Amrita Ghosh and Eytan Grosfeld
Phys. Rev. B 103, 205118 – Published 10 May 2021

Abstract

We study hard-core bosons on the honeycomb lattice in the presence of anisotropic nearest-neighbor repulsive interactions. Using a quantum Monte Carlo (QMC) technique, we extract the phase diagram of the model in terms of the filling and the anisotropy. At half-filling we find a dimer insulator phase near maximum anisotropy that is characterized by a finite topological entanglement entropy ln(2)/2, indicative of a fractional quantum Hall state for bosons. We identify the presence of edge states and derive a QMC-based method to extract and verify their chirality. Remarkably, this phase arises in the absence of magnetic flux and without explicit lattice frustration.

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  • Received 23 December 2020
  • Accepted 21 April 2021

DOI:https://doi.org/10.1103/PhysRevB.103.205118

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Amrita Ghosh and Eytan Grosfeld

  • Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel

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Issue

Vol. 103, Iss. 20 — 15 May 2021

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