Quasi-Particles, Thermodynamic Consistency, and the Gap Equation
Author
Source
Advances in Mathematical Physics
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-07-10
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
The thermodynamic potentials of superconducting electrons are derived by means of the Bogoliubov-Valatin formalism.
The thermodynamic potentials can be obtained by computing the free energy of a gas of quasi-particles, whose energy spectrum is conditional on the gap function.
However, the nontrivial dependence of the gap on the temperature jeopardises the validity of the standard thermodynamic relations.
In this article, it is shown how the thermodynamic consistency (i.e., the validity of the Maxwell relations) is recovered, and the correction terms to the quasi-particles potentials are computed.
It is shown that the Bogoliubov-Valatin transformation avoids the problem of the thermodynamic consistency of the quasi-particle approach; in fact, the correct identification of the variables, which are associated with the quasi-particles, leads to a precise calculation of the quasi-particles vacuum energy and of the dependence of the chemical potential on the electron density.
The stationarity condition for the grand potential coincides with the gap equation, which guarantees the thermodynamic consistency.
The expressions of various thermodynamic potentials, as functions of the (T,V,N) variables, are produced in the low temperature limit; as a final check, a rederivation of the condensation energy is presented.
American Psychological Association (APA)
Guadagnini, Enore. 2017. Quasi-Particles, Thermodynamic Consistency, and the Gap Equation. Advances in Mathematical Physics،Vol. 2017, no. 2017, pp.1-9.
https://search.emarefa.net/detail/BIM-1123243
Modern Language Association (MLA)
Guadagnini, Enore. Quasi-Particles, Thermodynamic Consistency, and the Gap Equation. Advances in Mathematical Physics No. 2017 (2017), pp.1-9.
https://search.emarefa.net/detail/BIM-1123243
American Medical Association (AMA)
Guadagnini, Enore. Quasi-Particles, Thermodynamic Consistency, and the Gap Equation. Advances in Mathematical Physics. 2017. Vol. 2017, no. 2017, pp.1-9.
https://search.emarefa.net/detail/BIM-1123243
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1123243