title: A self-consistent GW approach to the van der Waals potential for a helium dimer.
abstract: van der Waals interaction between two helium (He) atoms is studied by calculating the total energy as a function of the He-He distance within the self-consistent GW approximation, which is expected to behave correctly in the long wavelength limit. In the Born-Oppenheimer (BO) approximation, the pair potential curve has its minimum value at 2.87 Å, which is somewhat larger than the local density approximation result, 2.40 Å, and is closer to previous quantum chemistry results. The expectation value for the interatomic distance, calculated by solving the Schrödinger equation for the two nuclei problem using the BO potential energy curve, is 30 Å, which is smaller but of the same order as previous experimental and theoretical results.
authors.affiliation: Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan. ohno@ynu.ac.jp.
authors.forename: Toru
authors.initials: T
authors.lastname: Shoji
authors.forename: Riichi
authors.initials: R
authors.lastname: Kuwahara
authors.forename: Shota
authors.initials: S
authors.lastname: Ono
authors.forename: Kaoru
authors.initials: K
authors.lastname: Ohno