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Quantum phase transitions of interacting bosons and the supersolid phase

Date Issued
1995-01-01
Author(s)
van, Otterlo A
Wagenblast,
Baltin,
Bruder,  
Fazio,
Schön,
DOI
10.1103/physrevb.52.16176
Abstract
We investigate the properties of strongly interacting bosons in two dimensions at zero temperature using mean-field theory, a variational ansatz for the ground-state wave function, and Monte Carlo methods. With on-site and short-range interactions a rich phase diagram is obtained. Apart from the homogeneous superfluid and Mott-insulating phases, inhomogeneous charge-density wave phases appear, that are stabilized by the finite-range interaction. Furthermore, our analysis demonstrates the existence of a supersolid phase, in which both long-range order (related to the charge-density wave) and off-diagonal long-range order coexist. We also obtain the critical exponents for the various phase transitions.
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