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Bose-Einstein condensates in a ring potential: Time-evolution beyond the mean-field approximation

Gunnar Eriksson, J. Bengtsson, Elife Öznur Karabulut, G. M. Kavoulakis, S. M. Reimann

Published Jun 2, 2017• 1 citation
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Based on the mean-field approximation and a phase-space analysis, we discuss the dynamics of Bose-Einstein condensates (BECs) in a double-well potential. The condensates are found to be trapped in the time-dependent eigenstates of the effective Hamiltonian; we refer to this effect as time-dependent self-trapping of BECs. By comparison of this self-trapping with the adiabatic evolution, we find that adiabatic evolution beyond the traditional adiabatic condition can be achieved in BECs. Furthermore, the population imbalance of the BECs in the wells can be controlled by manipulating the atom-atom couplings and the driving field. The fixed points for the system are also calculated and discussed.