Generalization of the BTK Theory to the Case of Finite Quasiparticle Lifetimes


Autoria(s): Rohanizadegan, Yousef
Contribuinte(s)

Department of Physics

Data(s)

24/01/2013

24/01/2013

24/01/2013

Resumo

A generalization to the BTK theory is developed based on the fact that the quasiparticle lifetime is finite as a result of the damping caused by the interactions. For this purpose, appropriate self-energy expressions and wave functions are inserted into the strong coupling version of the Bogoliubov equations and subsequently, the coherence factors are computed. By applying the suitable boundary conditions to the case of a normal-superconducting interface, the probability current densities for the Andreev reflection, the normal reflection, the transmission without branch crossing and the transmission with branch crossing are determined. Accordingly the electric current and the differential conductance curves are calculated numerically for Nb, Pb, and Pb0.9Bi0.1 alloy. The generalization of the BTK theory by including the phenomenological damping parameter is critically examined. The observed differences between our approach and the phenomenological approach are investigated by the numerical analysis.

Identificador

http://hdl.handle.net/10464/4185

Idioma(s)

eng

Publicador

Brock University

Palavras-Chave #BTK Generalization Lifetime Quasiparticle Finite
Tipo

Electronic Thesis or Dissertation