Nonclassical dynamics of Bose condensates in an optical lattice in the superfluid regime
arXiv:0706.2078 · doi:10.1103/PhysRevA.75.053610
Abstract
A condensate in an optical lattice, prepared in the ground state of the superfluid regime, is stimulated first by suddenly increasing the optical lattice amplitude and then, after a waiting time, by abruptly decreasing this amplitude to its initial value. Thus the system is first taken to the Mott regime and then back to the initial superfluid regime. We show that, as a consequence of this nonadiabatic process, the system falls into a configuration far from equilibrium whose superfluid order parameter is described in terms of a particular superposition of Glauber coherent states that we derive. We also show that the classical equations of motion describing the time evolution of this system are inequivalent to the standard discrete nonlinear Schreodinger equations. By numerically integrating such equations with several initial conditions, we show that the system loses coherence, becoming insulating.
arXiv comment5 pages, 4 figures
References in corpus (15)
- Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
- Cold bosonic atoms in optical lattices
- Collapse and Revival of the Matter Wave Field of a Bose-Einstein Condensate
- Discrete Solitons and Breathers with Dilute Bose-Einstein Condensates
- Josephson Junction Arrays with Bose-Einstein Condensates
- Controlled Collisions for Multiparticle Entanglement of Optically Trapped Atoms
- Coherent transport of neutral atoms in spin-dependent optical lattice potentials
- Superfluid and Dissipative Dynamics of a Bose-Einstein Condensate in a Periodic Optical Potential
- Correlations and Counting Statistics of an Atom Laser
- Oscillating Superfluidity of Bosons in Optical Lattices
- Superfluid current disruption in a chain of weakly coupled Bose-Einstein Condensates
- Superfluid Dynamics of a Bose-Einstein Condensate in a Periodic Potential
- Superfluid-insulator transition in a moving system of interacting bosons
- Binary Mixtures of Bose-Einstein Condensates: Phase dynamics and Spatial Dynamics
- From the superfluid to the Mott regime and back: triggering a non-trivial dynamics in an array of coupled condensates