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Screening of a Fixed Charge in the Modified Hubbard Approximation
Author(s) -
Pathak A. P.
Publication year - 1971
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220460106
Subject(s) - hubbard model , limit (mathematics) , charge (physics) , condensed matter physics , compressibility , electron , range (aeronautics) , physics , quantum electrodynamics , quantum mechanics , materials science , mathematics , mathematical analysis , thermodynamics , superconductivity , composite material
Using a modified Hubbard approximation for the static dielectric function, numerical calculations of the screening charge density around a fixed foreign charge in an electron liquid are presented for values of r s corresponding to the metallic density range. The screening parameter has been taken to reproduce the compressibility limit properly. The results are compared with those based on the original Hubbard approximation as calculated by Langer and Vosko, and it is found that the difference is small but not negligible.