Phase diagram of anisotropic boson t-J model

TL;DR

This study uses Quantum Monte Carlo simulations to explore the phase diagram of an anisotropic boson t-J model, revealing coexistence of superfluid and antiferromagnetic phases without a checkerboard supersolid.

Contribution

It provides the first detailed phase diagram of the anisotropic boson t-J model, highlighting phase coexistence and absence of the supersolid phase.

Findings

Coexistence of superfluid and antiferromagnetic phases at low hole density.

No evidence of a two-component checkerboard supersolid phase.

Phase behavior consistent across different anisotropy parameters.

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-Jperp model, with Jperp=a Jz. Coexistence of superfluid hole-rich and insulating, antiferromagnetically ordered hole-free phases is observed at sufficiently low hole density, for any a < 1. A two-component checkerboard supersolid phase is not observed. The experimental relevance and possible broader implications of these findings are discussed.