Séminaire du LPTMS: Alessio Recati


11:00 - 12:00

LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay
15 Rue Georges Clemenceau, Orsay, 91405

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Coherently driven 2-component Bose gases

Alessio Recati (Università di Trento, Italia)

In the present talk I will give an overview on the physics of 2-component Bose gases in presence of an spin exchange – Rabi – term. The Rabi term reduces the gauge symmetry of the system  and a gap opens for relative phase excitations. The latter has many consequences. In particular it  leads to the formation of vortex dimers coupled  through sine-Gordon solitons. Results on the dynamics of the vortex dimer are presented. The system exhibits also a second order (quantum) phase transition between a neutral (paramagnetic) and a polarised (ferromagnetic) state, provided the interspecies interaction is large enough. I will discuss some phenomena related to the phase transition and to the  two phases  and the interplay  between Rabi coupling and density-density interaction:

(i) at a mean-field level for a continuous model – which well described atoms in a shallow trap.

(ii) for a one-dimensional single band Hubbard model – which should properly describe atoms  confined in an one-dimensional optical lattice. 

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