Square wave oscillation of soliton in double-well potential trapped BEC
arXiv:1903.00141
Abstract
We numerically investigate the soliton tunnelling process in double-well potential trapped Bose-Einstein condensate. Comparing with the usual low energy few particle tunnelling process, we find that the soliton tunnelling leads to massive particle transport between two wells. The {population imbalance} between two wells is not evolving sinusoidally with the time as the Josephson plasma oscillation, but shows a higher density contrast square-wave pattern due to the reflections at the trapping potential boundaries. Such unusual behavior clearly demonstrates the topologically stable, localized nature of solitons that propagate in a nonlinear medium without spreading. The square-wave oscillation of soliton also provides measurable dynamics to define a qubit in cold altom system.
10 pages, 6 figures
References in corpus (6)
- Oscillations and interactions of dark and dark-bright solitons in Bose-Einstein condensates
- Formation of bright matter-wave solitons during the collapse of Bose-Einstein condensates
- Dynamics of a tunable superfluid junction
- Josephson plasma oscillations and the Gross-Pitaevskii equation: Bogoliubov approach vs two-mode model
- Beyond standard two-mode dynamics in Bosonic Josephson junctions
- Tunneling phase gate for neutral atoms in a double-well lattice