Collective quantum tunneling of a Bose-Einstein condensate between two parts of an optical lattice separated by an energy barrier is theoretically investigated. We show that by a pulsewise change of the barrier height, it is possible to switch between a tunneling regime and a self-trapped one. This property of the system is explained by effectively reducing the nonlinear dynamics of the system to that of a particle moving in a double square well potential. The analysis is performed for both attractive and repulsive interatomic forces, and emphasizes the experimental relevance of our findings.
Driven collective quantum tunneling of ultracold atoms in engineered optical lattices / R., Khomeriki; S., Ruffo; Wimberger, Sandro Marcel. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 77:4(2007), p. 40005. [10.1209/0295-5075/77/40005]