Supersolidity from defect-condensation in the extended boson Hubbard model

Details Supersolidity from defect-condensation in the extended boson Hubbard model Supersolidity from defect-condensation in the extended boson Hubbard model

2007-08-14

arxiv.org/abs/0708.1807v2

Phys. Rev. B 77, 014524 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex 4, 6 pages, 9 figures

Scientific paper

10.1103/PhysRevB.77.014524

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.

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