Real and imaginary energy gaps: a comparison between single excitation Superradiance and Superconductivity and robustness to disorder

Nahum C. Chavez, Francesco Mattiotti, J. A. Mendez-Bermudez +2

A comparison between the single particle spectrum of the discrete Bardeen-Cooper-Schrieffer (BCS) model, used for small superconducting grains, and the spectrum of a paradigmatic m…