Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2002-08-12
Laser Physics, vol. 13, 547-550 (2003)
Physics
Condensed Matter
Statistical Mechanics
9 pages, 3 figures, prepared for the 'Laser Physics Workshop 2000', seminar on 'Bose-Einstein Condensation of Trapped Atoms',
Scientific paper
We analyze the periodic tunneling of a Bose-Einstein condensate in a double-well potential which has an oscillating energy barrier. We show that the dynamics of the Bose condensate critically depends on the frequency $\omega$ of the oscillating energy barrier. In the regime of periodic macroscopic quantum tunneling (PMQT) with frequency $\omega_J$, the population imbalance of the condensate in the two wells can be enhanced under the condition of parametric resonance $\omega = 2 \omega_J$. Instead, in the regime of macroscopic quantum self-trapping (MQST), we find that MQST can be reduced or suppressed under the condition of parametric resonance between the frequency $\omega$ of the energy barrier and the frequency $\omega_{ST}$ of oscillation through the barrier of the very small fraction of particles which remain untrapped during MQST.
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