Electromagnetic Response of the BCS Superconductor: Flow Equation Approach |
| M. Zapalska and T. Domański
Institute of Physics, M. Curie Sklodowska University, Radziszewskiego 10, 20-031 Lublin, Poland |
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| We address the linear response for superconductors using the non-perturbative technique based on the continuous unitary transformation. We discuss how this method rigorously reproduces the standard BCS solution and point out how such result can be generalized to the case of electron systems with strong pairing fluctuations and in presence of the nonequilibrium phenomena. |
| DOI: 10.12693/APhysPolA.121.854 PACS numbers: 74.20.Fg, 71.10.Li, 05.10.Cc |