Volume 77, Number 4, February 2007
|Number of page(s)||5|
|Published online||06 February 2007|
Driven collective quantum tunneling of ultracold atoms in engineered optical lattices
Dipartimento di Energetica “S. Stecco” and CSDC, Università di Firenze and INFN - Via S. Marta 3, 50139 Firenze, Italy
2 Department of Exact and Natural Sciences, Tbilisi State University - 0128 Tbilisi, Georgia
3 CNR-INFM and Dipartimento di Fisica “E. Fermi”, Università degli Studi di Pisa - Largo Pontecorvo 3, 56127 Pisa, Italy
Accepted: 19 December 2006
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.
PACS: 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 75.45.+j – Macroscopic quantum phenomena in magnetic systems
© Europhysics Letters Association, 2007
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