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Accueil > FR > Recherche > Physique des Atomes Froids > Séminaire du groupe

Laurent de Forges de Parny (Laboratoire de Physique - Ecole Normale Supérieure de Lyon, France)

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Le 26 février 2016 - 11h - salle 172, Bat. P5 bis

Recent Advances in Ultracold Atomic Gases : Bosonic Mixtures and Quantum Magnetism

This pedagogic seminar focuses on ultracold atoms in optical lattices.
The strong interactions between particles give rise to surprising behaviors, unequalled in condensed matter physics. In particular, recent progress in the field have allowed the study of bosonic systems with multiple components, such as atomic and molecular mixtures and bosons with spin degree of freedom. The richness of these systems comes from the competition between different terms of the Hamiltonian, leading to multi-component Bose-Einstein condensates, multiple transitions and quantum magnetism.

Two systems, involving conversions between the different species of particles trapped, particularly drew my attention : an atomic and molecular model and a spin-1 bosonic model. I will show that these systems exhibit intriguing phases (e.g. Nematic and ferromagnetic superfluids, Feshbach insulator), as well as many phase transitions (e.g. quantum first order, singlet-to-nematic, Ising transition). Some of my numerical results discussed in this seminar, obtained by using the exact quantum Monte Carlo approach, have just been experimentally observed.