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Green's Function Method in Thermo‐Field Dynamics: Applications to Plasma and Laser Heated Matter
Author(s) -
Ye Zhen
Publication year - 1993
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.2221790114
Subject(s) - field (mathematics) , plasma , green's function , function (biology) , electron , frame (networking) , laser , warm dense matter , dynamics (music) , ion , physics , pulse (music) , statistical physics , mathematics , computer science , quantum mechanics , pure mathematics , voltage , telecommunications , evolutionary biology , acoustics , biology
This paper, on one hand, is an introduction to thermo‐field dynamics (TFD), on the other hand a derivation of some interesting features of Green's functions in the frame of thermo‐field dynamics. It is proved that in the language of TFD, Green's functions at finite temperature take a very simple form. Through the applications of TFD to many‐body systems it is shown that TFD is a straightforward method in dealing with finite temperature many‐body systems. As an application of Green's function method in TFD, we derive a Kogan‐type formula for the non‐equilibrium dynamic conductivity or laser‐pulse heated condensed matters, where electrons and ions are held at different temperatures.