Supersolidity from defect-condensation in the extended boson Hubbard model

Abstract

We study the ground state phase diagram of the hard-core extended boson Hubbard model on the square lattice with both nearest- (nn) and next-nearest-neighbor (nnn) hopping and repulsion, using Gutzwiller mean field theory and quantum Monte Carlo simulations. We observe the formation of supersolid states with checkerboard, striped, and quarter-filled crystal structures, when the system is doped away from commensurate fillings. In the striped supersolid phase, a strong anisotropy in the superfluid density is obtained from the simulations; however, the transverse component remains finite, indicating a true two-dimensional superflow. We find that upon doping, the striped supersolid transitions directly into the supersolid with quarter-filled crystal structure, via a first-order stripe melting transition.

Revtex 4, 6 pages, 9 figures

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Cited by in corpus (9)

• Supersolid phase induced by correlated hopping in spin-1/2 frustrated quantum magnets
• Phase diagram of the Ising square lattice with competing interactions
• Vacancy supersolid of hard-core bosons on the square lattice
• Supersolid phases in the extended boson hubbard model
• Supersolids in one dimensional Bose Fermi mixtures
• Mechanisms for Spin-Supersolidity in S=1/2 Spin-Dimer Antiferromagnets
• Monte Carlo studies of the Ising square lattice with competing interactions
• Zero-temperature phase transitions in dilute bosonic superfluids on a lattice
• Coexistence of long-range orders in a Bose-Holstein model