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Contribution to the theory of nonlinear response
Author(s) -
Stolz H.
Publication year - 1966
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.19660180126
Subject(s) - degenerate energy levels , nonlinear system , quadratic equation , scalar (mathematics) , order (exchange) , physics , scalar potential , mathematics , fermi gas , statistical physics , mathematical analysis , theoretical physics , electron , mathematical physics , quantum mechanics , geometry , economics , finance
The second order density response to a scalar external potential is calculated for a system of identical particles, applying the techniques of temperature‐dependent Green's functions developed by Kadanoff and Baym. The general expressions for the quadratic density response and the second order contribution to the effective potential can be simplified for a highly degenerate electron gas.