Accueil du site > Production et diffusion scientifique > Séminaires > Archives > 2010 > Exploring Exotic Quantum Matter in Innsbruck : Ultracold Erbium Atoms and Efimov states
Jeudi 10 juin 2010, 11 h, salle Balmer
Exploring Exotic Quantum Matter in Innsbruck : Ultracold Erbium Atoms and Efimov states
Francesca FERLAINO
Institut für Experimentalphysik, Universität Innsbruck, Austria
In the first part of the talk, I will present the newborn experiment in Innsbruck operating with erbium atoms. Over the last years, the frontiers of ultracold quantum gases have been enlarged to new non- alkali atomic species, opening up intriguing possibilities for a variety of new applications. Erbium is a very interesting species, being an extremely heavy (166 a. u.) and strongly magnetic (7 Bohr Magnetons) rare-earth atom with a rich isotopic variety and a complex energy level structure. The unique combination of interesting properties allows studies of dipolar effects where the anisotropic and long-range dipole-dipole interactions dominating over the simple isotropic contact interaction. With erbium Feshbach molecules a more extreme situation can be achieved where the strength of the dipole-dipole interaction even gets close to the one between ground-state polar molecules.
In the second part of the talk, I will present our latest results on Efimov physics, obtained in an experiment operating with cesium atoms and molecules. I will first give an overview of the previous observations in this system for purely atomic samples, atom-dimer mixtures, and pure dimer samples. I will then report on a fundamental step beyond the Efimov scenario by investigating universal four-body processes. Our findings provide a strong evidence for the existence of a pair of four-body states, which is strictly connected to Efimov trimers via universal relations.
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