Quantum-size effects and shape resonances in nanoscale superconductors

Datum: 30 maart 2016

Locatie: University of Antwerp - Campus Groenenborger - Room U.241 - Groeneborgerlaan 171 - 2610 Antwerp

Tijdstip: 16 - 17 uur

Korte beschrijving: Condensed Matter Theory seminar given by Luca Flammia

When the dimensions of a superconductor are of the order of the Fermi wavelength, the superconducting properties are strongly influenced by quantum confinement that discretes the energy levels near the Fermi level and modifies electronic structures, leading to the variation of the density of states. In this regime, since the number of Cooper pairs becomes dependent on the size and the shape of the specimen, we expect quantum-size oscillations in T_C and the superconducting order parameter accompanied by substantial enhancements of superconductivity.

In this talk we present our method to study the ultrathin superconductivity in stripes and films — numerical results of the BdG equations are performed at zero temperature and at mean-field level. In this way, information on the full quasi-particle energy spectrum are collected and they can be compared directly with scanning tunneling microscope (STM) experiments.

Luca Flammia, CMT group, UAntwerp

Contact e-mail: lucian.covaci@uantwerpen.be

Url: http://cmt.uantwerpen.be