Loop updates for quantum Monte Carlo simulations in the canonical ensemble.
We present a new nonlocal updating scheme for quantum Monte Carlo simulations, which conserves particle number and other symmetries. It allows exact symmetry projection and direct evaluation of the equal-time Green's function and other observables in the canonical ensemble. The method is applicable to a wide variety of systems. We show results for bosonic atoms in optical lattices, neutron pairs in atomic nuclei, and electron pairs in ultrasmall superconducting grains.
Rombouts
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Universiteit Gent -- UGent, Vakgroep Subatomaire en Stralingsfysica Proeftuinstraat 86, B-9000 Gent, Belgium.
Van Houcke
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Pollet
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