Complex phases in the doped two-species bosonic Hubbard Model

Abstract

We study a two-dimensional bosonic Hubbard model with two hard-core species away from half filling using Quantum Monte Carlo simulations. The model includes a repulsive interspecies interaction and different nearest-neighbor hopping terms for the two species. By varying the filling we find a total of five distinct phases, including a normal liquid phase at higher temperature, and four different phases at lower temperature. We find an anti-ferromagnetically ordered Mott insulator and a region of coexistent anti-ferromagnetic and superfluid phases near half filling. Further away from half filling the phase diagram displays a superfluid phase and a novel phase inside the superfluid region at even lower temperatures. In this novel phase separated region, the heavy species has a Mott behavior with integer filling, while the lighter species shows phase separated Mott and superfluid behaviors.

5 pages, 4 figures

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Cited by in corpus (4)

• Two-species hard-core bosons on the triangular lattice: A quantum Monte Carlo study
• Competing supersolids of Bose-Bose mixtures in a triangular lattice
• Competing exotic quantum phases of spin-$1/2$ ultra-cold lattice bosons with extended spin interactions
• Ferromagnetic phase in the polarized two-species bosonic Hubbard Model