Phase diagram of an anisotropic bosonic t-J model

M Boninsegni
Nikolai Prokof'ev, University of Massachusetts - Amherst

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This is the pre-published version harvested from ArXiv. The published version is located at http://prb.aps.org/abstract/PRB/v77/i9/e092502

Abstract

We have studied by quantum Monte Carlo simulations the low temperature phase diagram of a mixture of isotopic, hard core bosons, described by the t-Jz-J⊥ model, with J⊥=αJz. The coexistence of superfluid hole-rich and insulating, antiferromagnetically ordered hole-free phases is observed at sufficiently low hole density for any α<1. A two-component checkerboard supersolid phase is not observed. The experimental relevance and possible broader implications of these findings are discussed.