Quantum phase transitions in a two-species hard-core boson Hubbard model in two dimensions

Pochung Chen, Min-Fong Yang
2010 Physical Review B  
We investigate various quantum phase transitions of attractive two-species bosons in a square lattice. Using the algorithm based on the tensor product states, the phase boundaries of the pair superfluid states with nonzero pair condensate density and vanishing atomic condensate density are determined. Various quantum phase transitions across the phase boundaries are characterized. Our work thus provides guides to the experimental search of the pair superfluid phase in lattice boson systems.
doi:10.1103/physrevb.82.180510 fatcat:xlifjbd2cbevvhdnmiaihon63u