Università Cattolica del Sacro Cuore

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

Seminario  10 dicembre 2018
Aula: Sala Riunioni -  Ore: 14.00
Via Musei 41, Brescia

Seminar lecture in the framework of International doctoral school in Science

Nahum C. CHAVEZ (PhD student @Benemerita Universidad Autonoma de Puebla - Mexico) will deliver a lecture.

Chairperson: Ph.D student Paolo FRANCESCHINI

Abstract
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 model of Single Excitation Superradiance is presented. Specifically, we study analytically the conditions under which a gapped state emerges in an equally spaced energy spectrum (Picket Fence) due to two different all-to-all couplings: a real and an imaginary one. While the former corresponds to the discrete BCS-model describing the coupling of Cooper pairs in momentum space and it induces a Superconductive regime, the latter describes the coupling of single particle energy levels to a common decay channel and it induces a Superradiant transition.



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