Quantum Monte Carlo simulation in the canonical ensemble at finite temperature

Details Quantum Monte Carlo simulation in the canonical ensemble at finite temperature Quantum Monte Carlo simulation in the canonical ensemble at finite temperature

2005-08-18

arxiv.org/abs/cond-mat/0508431v2

Phys.Rev. E73 (2006) 056703

Physics

Condensed Matter

Statistical Mechanics

11 pages, 8 figures

Scientific paper

10.1103/PhysRevE.73.056703

A quantum Monte Carlo method with non-local 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.

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