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First-principles method for impurities in quantum fluids: Positron in an electron gas

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Article number035107
<mark>Journal publication date</mark>9/07/2010
<mark>Journal</mark>Physical review B
Number of pages17
Publication StatusPublished
<mark>Original language</mark>English


We propose a first-principles methodology for calculating the behavior of isolated impurities immersed in quantum fluids. To obtain an accurate description of correlation effects between the impurity and the host, we work in the frame of reference in which the impurity is stationary, building on the work of C. H. Leung, M. J. Stott and C. O. Almbladh Phys. Lett. 57A 26 (1976). We apply our methodology to the case of a positron immersed in an electron gas. 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” after the Fermi edge.

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© 2010 The American Physical Society