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

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

2007-07-31

arxiv.org/abs/0707.4630v1

Physics

Condensed Matter

Other Condensed Matter

Contribution to RPMBT14 conference. To be published in a volume of the Series on Advances in Quantum Many-Body by World Scient

Scientific paper

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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