title: Quantum Monte Carlo study of a positron in an electron gas.
abstract: Quantum Monte Carlo calculations of the relaxation energy, pair-correlation function, and annihilating-pair momentum density are presented for a positron immersed in a homogeneous electron gas. We find smaller relaxation energies and contact pair-correlation functions in the important low-density regime than predicted by earlier studies. Our annihilating-pair momentum densities have almost zero weight above the Fermi momentum due to the cancellation of electron-electron and electron-positron correlation effects.
authors.affiliation: Department of Physics, Lancaster University, United Kingdom.
authors.forename: N D
authors.initials: ND
authors.lastname: Drummond
authors.forename: P
authors.initials: P
authors.lastname: López Ríos
authors.forename: R J
authors.initials: RJ
authors.lastname: Needs
authors.forename: C J
authors.initials: CJ
authors.lastname: Pickard
mesh_terms: D004583:Electrons; D009010:Monte Carlo Method; D011789:Quantum Theory; D013057:Spectrum Analysis