Quantum Monte Carlo simulation in the canonical ensemble at finite temperature

Journal Article · Mon May 15 04:00:00 EDT 2006 · Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

DOI:https://doi.org/10.1103/PHYSREVE.73.056703· OSTI ID:21069782

Houcke, K van; Rombouts, S M. A.; Pollet, L ^[1]

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1. Universiteit Gent, UGent, Vakgroep Subatomaire en Stralingsfysica, Proeftuinstraat 86, B-9000 Gent (Belgium)

A quantum Monte Carlo method with a nonlocal update scheme is presented. The method is based on a path-integral decomposition and a worm operator which is local in imaginary time. It generates states with a fixed number of particles and respects other exact symmetries. Observables like the equal-time Green's function can be evaluated in an efficient way. To demonstrate the versatility of the method, results for the one-dimensional Bose-Hubbard model and a nuclear pairing model are presented. Within the context of the Bose-Hubbard model the efficiency of the algorithm is discussed.

• OSTI ID: 21069782
• Journal Information: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics Journal Issue: 5 Vol. 73; ISSN PLEEE8; ISSN 1063-651X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALGORITHMS
COMPUTERIZED SIMULATION
EFFICIENCY
GREEN FUNCTION
HUBBARD MODEL
MONTE CARLO METHOD
NUCLEAR MODELS
ONE-DIMENSIONAL CALCULATIONS
PATH INTEGRALS
SUPERFLUIDITY
SYMMETRY