Quantum Monte Carlo Study of a Positron in an Electron Gas

Details Quantum Monte Carlo Study of a Positron in an Electron Gas Quantum Monte Carlo Study of a Positron in an Electron Gas

2011-04-28

arxiv.org/abs/1104.5441v1

Phys. Rev. Lett 107, 207402 (2011)

Physics

Condensed Matter

Statistical Mechanics

5 pages

Scientific paper

10.1103/PhysRevLett.107.207402

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.

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