Path Integral Ground State with a Fourth-Order Propagator: Application to Condensed Helium

Details Path Integral Ground State with a Fourth-Order Propagator: Application to Condensed Helium Path Integral Ground State with a Fourth-Order Propagator: Application to Condensed Helium

2004-12-27

arxiv.org/abs/cond-mat/0412707v3

Journal of Chemical Physics 122, 114504 (2005)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1063/1.1872775

Ground state properties of condensed Helium are calculated using the Path Integral Ground State (PIGS) method. A fourth-order approximation is used as short (imaginary) time propagator. We compare our results with those obtained with other Quantum Monte Carlo techniques and different propagators. For this particular application, we find that the fourth-order propagator performs comparably to the pair product approximation, and is far superior to the primitive approximation. Results obtained for the equation of state of condensed Helium show that PIGS compares favorably to other QMC methods traditionally utilized for this type of calculation.

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