ATTENTION !!! SEMINAIRE ANNULE !!! Topological aspects of driven condensed matter systems : realizations of Floquet-Andreev levels in Josephson Junctions.
Mardi 24 avril 2018 14:00
- Duree : 1 heure
Lieu : Salle « Remy Lemaire » (K223) de l’Institut Néel – au n°25 de la rue des martyrs, Grenoble
Orateur : Lucila Peralta Gavensky (Instituto Balseiro, CNEA-CONICET Bariloche, Argentine)
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The theoretical prediction and experimental potential of probing topological phenomena in mesoscopic samples has acquired an enormous and rapidly growing interest over the past few years. In this talk I will revisit very briefly some of the basic concepts of topology applied to condensed matter systems, the characterization of topological states of matter by highly non-local order parameters and the intrinsic relation of these topological invariants with adiabatic quantum transport. On the other hand, the possiblity of engineering topological band structures by driving conventional materials out of equilibrium will be discussed. Novel topological effects arise when applying external time periodic potentials owing to the picture provided by dressed Floquet-states. In particular, I will focus on our proposal of realizations of Floquet-Andreev bound states with non-trivial Chern numbers in driven three terminal Josephson junctions with a quantum dot. Indeed, non-trivial Berry curvatures develop in the artificial Brillouin zone determined by the superconductors phases when driving the junction with a chiral perturbation. We propose an experimentally suitable protocol to measure this gauge field by exploiting one of the main advantages of these mesoscopic setups : the potential to control the superconductor phases so as to perform local transport measurements in the junction.
Contact : Lucila Peralta Gavensky
Discipline évènement : (Physique)
Entité organisatrice : (Fondation Nanosciences)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire Nanoélectronique Quantique)
Site de l'évènement : Polygone scientifique
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