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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 > Cours - séminaires > Séminaire atomes froids du LKB : « Clock spectroscopy of interacting ytterbium atoms in deep optical lattices » par Raphael Bouganne.

Séminaire atomes froids du LKB : « Clock spectroscopy of interacting ytterbium atoms in deep optical lattices » par Raphael Bouganne.

Jeudi 7 décembre 2017 - de 13h30 a 14h30, en salle L 378/380 (24 rue Lhomond 75005 Paris).

Résumé

In our laboratory we study the physics of ultracold ytterbium atoms in optical lattices. We recently observed the quantum phase transition from a superfluid to a Mott insulator in two dimensions. For deep optical lattices, the system reduces to an array of disconnected and almost harmonic traps. Atoms are strongly localized near the anti-nodes of the optical lattices, with interaction energies per atom pair in the kHz regime due to the strong confinement.

After presenting our experimental setup and techniques to load a low-temperature quantum gas in the lattice, I will describe our recent measurements involving the metastable ’clock’ state of ytterbium [1]. We prepare Mott insulator phases with singly- and doubly-occupied isolated sites and probe the atoms using the ultra-narrow ’clock’ transition. Atoms in singly-occupied sites undergo coherent, long-lived Rabi oscillations. Atoms in doubly-occupied sites are strongly affected by interatomic interactions, and we measure their inelastic decay rates and energy shifts.

We deduce from these measurements all relevant collisional parameters involving both clock states, in particular the intra- and inter-state scattering lengths.