First-Principles Study of a Positron Immersed in an Electron Gas

Details First-Principles Study of a Positron Immersed in an Electron Gas First-Principles Study of a Positron Immersed in an Electron Gas

2010-02-25

arxiv.org/abs/1002.4748v1

Phys. Rev. B 82, 035107 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.82.035107

Calculations of the relaxation energy, contact pair-correlation function, and annihilating-pair momentum density for a single positron immersed in a homogeneous electron gas are presented. We achieve an accurate description of the electron-positron correlation effects by working in the reference frame in which the positron is stationary and using a mean-field approach based on single-component density functional theory. Our positron relaxation energies and annihilation rates are similar to those from the best existing many-body calculations. Our annihilating-pair momentum densities are significantly different from previous data, and include a "tail" beyond the Fermi edge.

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