Quantum-size effects in nanoscale superconductors with step-edge

Date: 17 October 2017

Venue: University of Antwerp - Campus Groenenborger - Room U.244 - Groenenborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger)

Time: 4:00 PM - 5:00 PM

Organization / co-organization: Condensed Matter Theory

Short description: Condensed Matter Theory seminar presented by Luca Flammia

Nanoscale superconductors show a range of interesting phenomena, often not achievable in their bulk counterpart. In particular,  when the size of the superconductor reduces to the range of electron Fermi wavelength, the formation of discretized electronic energy levels results in the oscillations of the density of states at the Fermi level with the size, leading to the oscillatory behavior in the superconducting critical temperature, i.e., quantum size effects.

By solving the Bogoliubov-de Gennes equations, we present our recent results about the impact of the step-edge on superconductivity and transport properties in nanoribbons and nanofilms, where quantum confinement dominates the emergent physics.  We show how the spatial distribution of the superconducting order parameter is profoundly changed by the step-edge and how the transport properties are non-trivially modified both in the proximity-induced superconducting order parameter and the Josephson effect.

Contact email: lucian.covaci@uantwerpen.be

Link: http://cmt.uantwerpen.be