I G Gurtubay et al 2010 J. Phys.: Condens. Matter 22 065501 doi:10.1088/0953-8984/22/6/065501
I G Gurtubay1,2, R Gaudoin2 and J M Pitarke1,3
Show affiliationsWe report variational and diffusion quantum Monte Carlo ground-state energies of the three-dimensional electron gas using a model periodic Coulomb interaction and backflow corrections for N = 54, 102, 178, and 226 electrons. We remove finite-size effects by extrapolation and we find lower energies than previously reported. Using the Hellman–Feynman operator sampling method introduced in Gaudoin and Pitarke (2007 Phys. Rev. Lett. 99 126406), we compute accurately, within the fixed-node approximation, the separate kinetic and interaction contributions to the total ground-state energy. The difference between the interaction energies obtained from the original Slater-determinant nodes and the backflow-displaced nodes is found to be considerably larger than the difference between the corresponding kinetic energies.
Issue 6 (17 February 2010)
Received 23 September 2009, in final form 9 January 2010
Published 27 January 2010
I G Gurtubay et al 2010 J. Phys.: Condens. Matter 22 065501
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