The table represents the condition on the order parameters ψ<sub><em>A</em></sub>, ψ<sub><em>B</em></sub> and ψ<sub><em>C</em></sub> and occupation densities ρ<sub><em>A</em></sub>, ρ<sub><em>B</em></sub> and ρ<sub><em>C</em></sub> that characterize the different compressible and insulating phases

2013-06-10T00:00:00Z (GMT) by Apurba Barman Saurabh Basu
<p><b>Table 2.</b> The table represents the condition on the order parameters ψ<sub><em>A</em></sub>, ψ<sub><em>B</em></sub> and ψ<sub><em>C</em></sub> and occupation densities ρ<sub><em>A</em></sub>, ρ<sub><em>B</em></sub> and ρ<sub><em>C</em></sub> that characterize the different compressible and insulating phases. The last two columns enumerate static structure factor, <em>S</em><sub><strong>q</strong></sub>(<strong>q = π, π</strong>) and the SF stiffness, α<sub><em>s</em></sub> for different phases.</p> <p><strong>Abstract</strong></p> <p>We investigate the phase diagram of interacting bosons in a tripartite lattice in two dimensions. An analytic computation of the phase diagram in the parameter space defined by the on-site boson–boson repulsion parameter and the chemical potential is done via a second-order strong coupling perturbation theory on the extended Bose–Hubbard model, which is hence supplemented by numerical mean-field calculations. Interesting results emerge in the form of exotic density ordered phases with one-third, two-third and unity filling of bosons per trimer. The pattern repeats as the chemical potential is increased. Further regions of supersolid and superfluid phases are noted in the numerical study of the mean-field model where the phase diagram shows a transition from compressible to insulating phases.</p>