Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-12-19
Phys. Rev. A 78 (2008) 063610-10
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Latex file, 24 pages, 3 figures
Scientific paper
10.1103/PhysRevA.78.063610
Cold atoms, loaded into an optical lattice with double-well sites, are considered. Pseudospin representation for an effective Hamiltonian is derived. The system in equilibrium displays two phases, ordered and disordered. The second-order phase transition between the phases can be driven either by temperature or by changing the system parameters. Collective pseudospin excitations have a gap disappearing at the phase-transition point. Dynamics of atoms is studied, when they are loaded into the lattice in an initially nonequilibrium state. It is shown that the temporal evolution of atoms, contrary to their equilibrium thermodynamics, cannot be described in the mean-field approximation, since it results in a structurally unstable dynamical system, but a more accurate description is necessary taking account of attenuation effects.
Yukalov V. I.
Yukalova E. P.
No associations
LandOfFree
Cold atoms in double-well optical lattices does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cold atoms in double-well optical lattices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cold atoms in double-well optical lattices will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-727021