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Claude Cohen Tannoudji

Prix Nobel en 1997 pour le ralentissement et le piégeage des atomes par la lumière laser.

Ses travaux sont à la source des recherches actuelles de l'IFRAF.



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Accueil du site > Annonces - Congrès - Workshops > Conférences et ateliers - Autres > 2016 > Séminaire atomes froids : « Weyl Semimetals in Artificial Gauge Potentials »

Séminaire atomes froids : « Weyl Semimetals in Artificial Gauge Potentials »

Michele Burrello (MPQ, Garching) : de 13h30 à 14h30, salle de réunion de l’IFRAF (45 rue d’Ulm) : 13 avril 2016.

Résumé

In the last year, several research groups worldwide managed to reproduce the physics of Weyl fermions and to obtain the exotic features of Weyl semimetals in different setups, including not only solid state compounds, but also photonic crystals. In this talk I will introduce the main features of this gapless 3D topological state of matter and I will focus on an alternative realization of Weyl semimetals based on a model for ultracold fermions in the presence of artificial magnetic fluxes in a cubic lattice.

I will study the stability of this system under several perturbations including trapping potentials and a random variations of the fluxes. In particular, I will show that for realistic sizes, this system behaves like a disordered Weyl semimetal, therefore it is stable against small perturbations of the artificial magnetic field. Finally I will address a more exotic state, characterized by double Weyl-points, which is obtained through the introduction of non-Abelian gauge potentials.