Weakly interacting two-dimensional system of dipoles: Limitations of the mean-field theory

Journal Article · Fri Jun 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.063630· OSTI ID:21000515

Astrakharchik, G E; Boronat, J; Casulleras, J; Kurbakov, I L; Lozovik, Yu E ^[1]

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1. Departament de Fisica i Enginyeria Nuclear, Campus Nord B4-B5, Universitat Politecnica de Catalunya, E-08034 Barcelona (Spain)

We consider a homogeneous two-dimensional Bose gas with repulsive dipole-dipole interactions. The ground-state equation of state, calculated using the diffusion Monte Carlo method, shows quantitative differences from the predictions of the commonly used Gross-Pitaevskii mean-field theory. The static structure factor, pair distribution function, and condensate fraction are calculated in a wide range of the gas parameter. Differences from mean-field theory are reflected in the frequency of the lowest ''breathing'' mode for harmonically trapped systems.

• OSTI ID: 21000515
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 75; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSE-EINSTEIN CONDENSATION
BOSE-EINSTEIN GAS
BOSONS
DIFFUSION
DIFFUSION EQUATIONS
DIPOLES
DISTRIBUTION FUNCTIONS
EQUATIONS OF STATE
FORECASTING
GROUND STATES
INTERACTIONS
MEAN-FIELD THEORY
MONTE CARLO METHOD
STRUCTURE FACTORS
TRAPPING
TWO-DIMENSIONAL CALCULATIONS