Equation of state of an interacting Bose gas at finite temperature: A path-integral Monte Carlo study

Journal Article · Sun Oct 15 00:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.043621· OSTI ID:20863962

Pilati, S; Giorgini, S ^[1]; Sakkos, K; Boronat, J; Casulleras, J ^[2]

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1. Dipartimento di Fisica, Universita di Trento and CRS-BEC INFM, I-38050 Povo (Italy)
2. Departament de Fisica i Enginyeria Nuclear, Campus Nord B4-B5, Universitat Politecnica de Catalunya, E-08034 Barcelona (Spain)

By using exact path-integral Monte Carlo methods we calculate the equation of state of an interacting Bose gas as a function of temperature both below and above the superfluid transition. The universal character of the equation of state for dilute systems and low temperatures is investigated by modeling the interatomic interactions using different repulsive potentials corresponding to the same s-wave scattering length. The results obtained for the energy and the pressure are compared to the virial expansion for temperatures larger than the critical temperature. At very low temperatures we find agreement with the ground-state energy calculated using the diffusion Monte Carlo method.

• OSTI ID: 20863962
• Journal Information: Physical Review. A, Vol. 74, Issue 4; Other Information: DOI: 10.1103/PhysRevA.74.043621; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BOSE-EINSTEIN GAS
BOSONS
COMPUTERIZED SIMULATION
CRITICAL TEMPERATURE
DIFFUSION
EQUATIONS OF STATE
EXPANSION
GROUND STATES
MONTE CARLO METHOD
PATH INTEGRALS
POTENTIALS
S WAVES
SCATTERING LENGTHS
SUPERFLUIDITY
TEMPERATURE DEPENDENCE