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.
|Titolo:||Reptation quantum Monte Carlo: A method for unbiased ground-state averages and imaginary-time correlations|
|Autori:||Baroni, S.; Moroni, S.|
|Data di pubblicazione:||1999|
|Digital Object Identifier (DOI):||10.1103/PhysRevLett.82.4745|
|Appare nelle tipologie:||1.1 Journal article|