Chiral bosonic topological insulator on the honeycomb lattice with anisotropic interactions

Amrita Ghosh, Eytan Grosfeld

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number205118
JournalPhysical Review B
Volume103
Issue number20
DOIs
StatePublished - 10 May 2021

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