title: Imaginary-chemical-potential quantum Monte Carlo method for Hubbard molecules.
abstract: We generalize the imaginary-chemical-potential quantum Monte Carlo (QMC) method proposed by Dagotto [Phys. Rev. B 41, R811 (1990)] to systems without particle-hole symmetry. The generalized method is tested by comparing the results of the QMC simulations and exact diagonalization on small Hubbard molecules, such as tetrahedron and truncated tetrahedron. Results of the application of the method to the C60 Hubbard molecule are discussed.
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1.
authors.forename: Fei
authors.initials: F
authors.lastname: Lin
authors.forename: Jurij
authors.initials: J
authors.lastname: Smakov
authors.forename: Erik S
authors.initials: ES
authors.lastname: Sørensen
authors.forename: Catherine
authors.initials: C
authors.lastname: Kallin
authors.forename: A John
authors.initials: AJ
authors.lastname: Berlinsky