Collective excitations in superconductors

The problem of collective excitations in short-range interaction model of a superconductor is studied by means of the Bethe-Salpeter equation for a matrix of vertex functions. Goldstone bosons and excitation-like modes are found, in the limit of vanishing momentum. The relation between the coupling...

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Bibliographic Details
Published in:Physica 1973-01, Vol.63 (2), p.384-392
Main Authors: Fazakas, A.B., Ciobanu, G.
Format: Article
Language:English
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Summary:The problem of collective excitations in short-range interaction model of a superconductor is studied by means of the Bethe-Salpeter equation for a matrix of vertex functions. Goldstone bosons and excitation-like modes are found, in the limit of vanishing momentum. The relation between the coupling constant and the existence of these excitations is discussed.
ISSN:0031-8914
DOI:10.1016/0031-8914(73)90324-8