Effective field theories for two-component repulsive bosons on lattice and their phase diagrams
Effective field theories for two-component repulsive bosons on lattice and their phase diagrams
In this paper, we consider the bosonic $t$-$J$ model, which describes two-component hard-core bosons with a nearest-neighbor (NN) pseudospin interaction and a NN hopping. To study the phase diagram of this model, we derive effective field theories for low-energy excitations. In order to represent the hard-core nature of bosons, we …