Quantum phase transition in a two-dimensional system of dipoles

Details Quantum phase transition in a two-dimensional system of dipoles Quantum phase transition in a two-dimensional system of dipoles

2006-08-10

arxiv.org/abs/cond-mat/0608246v3

Phys. Rev. Lett. 98, 060405 (2007)

Physics

Condensed Matter

Superconductivity

4 figures v.3 One citation added, updated Fig.4. Minor changes following referee's and editor's comments

Scientific paper

10.1103/PhysRevLett.98.060405

The ground-state phase diagram of a two-dimensional Bose system with dipole-dipole interactions is studied by means of quantum Monte Carlo technique. Our calculation predicts a quantum phase transition from gas to solid phase when the density increases. In the gas phase the condensate fraction is calculated as a function of the density. Using Feynman approximation, the collective excitation branch is studied and appearance of a roton minimum is observed. Results of the static structure factor at both sides of the gas-solid phase are also presented. The Lindeman ratio at the transition point comes to be $\gamma = 0.230(6)$. The condensate fraction in the gas phase is estimated as a function of the density.

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