We introduce a new stochastic method for calculating ground-state properties of quantum systems. Segments of a Langevin random walk guided by a trial wave function are subject to a Metropolis rejection test performed on the time integral of the local energy. The algorithm-which is as simple as variational Monte Carlo-for bosons provides exact expectation values of local observables, as well as their static and dynamic (in imaginary time) response functions, without mixed-estimate nor population-control biases. Our method is demonstrated with a few case applications to (4)He.
Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.11767/15892
Titolo: | Reptation quantum Monte Carlo: A method for unbiased ground-state averages and imaginary-time correlations |
Autori: | Baroni S; Moroni S |
Rivista: | |
Data di pubblicazione: | 1999 |
Volume: | 82 |
Fascicolo: | 24 |
Pagina iniziale: | 4745 |
Pagina finale: | 4748 |
Digital Object Identifier (DOI): | 10.1103/PhysRevLett.82.4745 |
Appare nelle tipologie: | 1.1 Journal article |
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