Quantum Phase Transition in a Two-Dimensional System of Dipoles

G. E. Astrakharchik, J. Boronat, I. L. Kurbakov, and Yu. E. Lozovik
Phys. Rev. Lett. 98, 060405 – Published 8 February 2007

Abstract

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

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  • Received 10 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.060405

©2007 American Physical Society

Authors & Affiliations

G. E. Astrakharchik1, J. Boronat1, I. L. Kurbakov2, and Yu. E. Lozovik2

  • 1Departament de Física i Enginyeria Nuclear, Campus Nord B4-B5, Universitat Politècnica de Catalunya, E-08034 Barcelona, Spain
  • 2Institute of Spectroscopy, 142190 Troitsk, Moscow region, Russia

See Also

Strongly Correlated 2D Quantum Phases with Cold Polar Molecules: Controlling the Shape of the Interaction Potential

H. P. Büchler, E. Demler, M. Lukin, A. Micheli, N. Prokof’ev, G. Pupillo, and P. Zoller
Phys. Rev. Lett. 98, 060404 (2007)

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Vol. 98, Iss. 6 — 9 February 2007

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