title: Directed update for the stochastic Green function algorithm.
abstract: In a recent paper we presented a stochastic Green function (SGF) algorithm, which has the properties of being general and easy to apply to any lattice Hamiltonian of the form H[over ]=V[over ]-T[over ] , where V[over ] is diagonal in the chosen occupation number basis and T[over ] has only positive matrix elements. We propose here a modified version of the update scheme that keeps the simplicity and generality of the original SGF algorithm, and significantly enhances its efficiency.
authors.affiliation: Instituut-Lorentz, LION, Universiteit Leiden, Postbus 9504, 2300 RA Leiden, The Netherlands.
authors.forename: V G
authors.initials: VG
authors.lastname: Rousseau