Matter-wave interference, Josephson oscillation and its disruption in a Bose-Einstein condensate on an optical lattice
arXiv:cond-mat/0308498 · doi:10.1016/j.nuclphysa.2004.03.090
Abstract
Using the axially-symmetric time-dependent mean-field Gross-Pitaevskii equation we study the Josephson oscillation in a repulsive Bose-Einstein condensate trapped by a harmonic plus an one-dimensional optical-lattice potential to describe the experiments by Cataliotti et. al. [Science 293 (2001) 843, New J. Phys. 5 (2003) 71.1]. After a study of the formation of matter-wave interference upon releasing the condensate from the optical trap, we directly investigate the alternating atomic superfluid Josephson current upon displacing the harmonic trap along the optical axis. The Josephson current is found to be disrupted upon displacing the harmonic trap through a distance greater than a critical distance signaling a superfluid to a classical insulator transition in the condensate.
5 pages; 8 ps and eps figures, Lead parallel session talk in the 17th International Conference on Few-Body Physics, Duke University 2003, to appear in Nuclear Physics A
References in corpus (8)
- Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
- Dynamical Superfluid-Insulator Transition in a Chain of Weakly Coupled Bose-Einstein Condensates
- Superfluid current disruption in a chain of weakly coupled Bose-Einstein Condensates
- Bose-Einstein condensation dynamics from the numerical solution of the Gross-Pitaevskii equation
- Mean-field model for Josephson oscillation in a Bose-Einstein condensate on an one-dimensional optical trap
- Mean-field model for the interference of matter waves from a three-dimensional optical trap
- Loss of superfluidity in a Bose-Einstein condensate via forced resonant oscillations
- Dynamical classical superfluid-insulator transition in a Bose-Einstein condensate on an optical lattice