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Quantum-Phase Transitions of Interacting Bosons and the Supersolid Phase

Anne van Otterlo·Karl-Heinz Wagenblast·Reinhard Baltin·C. Bruder·Rosario Fazio·Gerd Schön
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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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Anne van Otterlo, Karl-Heinz Wagenblast, Reinhard Baltin, C. Bruder, Rosario Fazio, Gerd Schön. 1995-08-17. Quantum-Phase Transitions of Interacting Bosons and the Supersolid Phase. https://doi.org/10.1103/physrevb.52.16176

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