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arXiv · 0707.4630

Ground state properties of a homogeneous 2D system of Bosons with dipolar interactions

G. E. Astrakharchik·J. Boronat·J. Casulleras·I. L. Kurbakov·Yu. E. Lozovik
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Abstract

The ground-state phase properties of a two-dimensional Bose system with dipole-dipole interactions is studied by means of quantum Monte Carlo techniques. Limitations of mean-field theory in a two-dimensional geometry are discussed. A quantum phase transition from gas to solid is found. Crystal is tested for existence of a supersolid in the vicinity of the phase transition. Existence of mesoscopic analogue of the off-diagonal long-range order is shown in the one-body density matrix in a finite-size crystal. Non-zero superfluid fraction is found in a finite-size crystal, the signal being dramatically increased in presence of vacancies.

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G. E. Astrakharchik, J. Boronat, J. Casulleras, I. L. Kurbakov, Yu. E. Lozovik. 2007-07-31. Ground state properties of a homogeneous 2D system of Bosons with dipolar interactions. https://doi.org/10.1142/9789812779885_0031

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