Università Cattolica del Sacro Cuore

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

 December 10 2018

Sala Riunioni -  Hour: 14.00
Via Musei 41, Brescia, Italy

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

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.