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Quantum Monte Carlo study of a positron in an electron gas

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Article number207402
<mark>Journal publication date</mark>8/11/2011
<mark>Journal</mark>Physical Review Letters
Issue number20
Number of pages5
<mark>Original language</mark>English


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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