Low-dimensional weakly interacting Bose gases: Nonuniversal equations of state
- Departament de Fisica i Enginyeria Nuclear, Campus Nord B4-B5, Universitat Politecnica de Catalunya, E-08034 Barcelona (Spain)
- Institute of Spectroscopy, RU-142190 Troitsk, Moscow Region (Russian Federation)
The zero-temperature equation of state is analyzed in low-dimensional bosonic systems. We propose to use the concept of energy-dependent s-wave scattering length for obtaining estimations of nonuniversal terms in the energy expansion. We test this approach by making a comparison to exactly solvable one-dimensional problems and find that the generated terms have the correct structure. The applicability to two-dimensional systems is analyzed by comparing with results of Monte Carlo simulations. The prediction for the nonuniversal behavior is qualitatively correct and the densities, at which the deviations from the universal equation of state become visible, are estimated properly. Finally, the possibility of observing the nonuniversal terms in experiments with trapped gases is also discussed.
- OSTI ID:
- 21388775
- Journal Information:
- Physical Review. A, Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevA.81.013612; (c) 2010 The American Physical Society; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOSE-EINSTEIN GAS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DENSITY
ENERGY DEPENDENCE
EQUATIONS OF STATE
EXACT SOLUTIONS
MONTE CARLO METHOD
ONE-DIMENSIONAL CALCULATIONS
S WAVES
SCATTERING LENGTHS
TRAPPING
TWO-DIMENSIONAL CALCULATIONS
CALCULATION METHODS
DIMENSIONS
EQUATIONS
EVALUATION
LENGTH
MATHEMATICAL SOLUTIONS
PARTIAL WAVES
PHYSICAL PROPERTIES
SIMULATION