Coherently driven 2-component Bose gases (Dr. A. Recati)
- Datum: 20.07.2016
- Uhrzeit: 11:30 - 12:30
- Vortragende(r): Dr. Alessio Recati, "INO-CNR BEC Center", Trento, Italy
- Raum: Herbert Walther Lecture Hall
- Gastgeber: MPQ, Theory Division
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 describes atoms
confined in an one-dimensional optical lattice.