Quantum Monte Carlo simulation of a two-dimensional Bose gas

Journal Article · Tue Feb 01 04:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.023605· OSTI ID:20650112

Pilati, S ^[1]; Boronat, J; Casulleras, J ^[2]; Giorgini, S ^[3]

---

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)
3. JILA, University of Colorado, Boulder, Colorado 80309-0440 (United States)

The equation of state of a homogeneous two-dimensional Bose gas is calculated using quantum Monte Carlo methods. The low-density universal behavior is investigated using different interatomic model potentials, both finite ranged and strictly repulsive and zero ranged, supporting a bound state. The condensate fraction and the pair distribution function are calculated as a function of the gas parameter, ranging from the dilute to the strongly correlated regime. In the case of the zero-range pseudopotential we discuss the stability of the gaslike state for large values of the two-dimensional scattering length, and we calculate the critical density where the system becomes unstable against cluster formation.

• OSTI ID: 20650112
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 71; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BOSE-EINSTEIN GAS
BOSONS
BOUND STATE
COMPUTERIZED SIMULATION
DENSITY
DISTRIBUTION FUNCTIONS
EQUATIONS OF STATE
MONTE CARLO METHOD
POTENTIALS
SCATTERING LENGTHS
STABILITY
TWO-DIMENSIONAL CALCULATIONS