Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 2: Ultra-cold atoms, ions and BEC I (with Q)

A 2.4: Vortrag

Montag, 14. März 2011, 11:15–11:30, BAR 106

Interaction Driven Interband Tunneling of Bosons in the Triple Well — •Lushuai Cao¹, Ioannis Brouzos¹, Sascha Zöllner², and Peter Schmelcher¹ — ¹Zentrum für Optische Quantentechnologien, Luruper Chaussee 149, D-22761 Hamburg, Germany — ²Niels Bohr International Academy, Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen, Denmark

We study the tunneling of a small ensemble of strongly repulsive bosons in a one-dimensional triple-well potential. The usual treatment within the single-band approximation suggests suppression of tunneling in the strong interaction regime. However, we show that several windows of enhanced tunneling are opened in this regime. This enhanced tunneling results from higher band contributions, and has the character of interband tunneling. It can give rise to various tunneling processes, such as single-boson tunneling and two-boson correlated tunneling of the ensemble of bosons, and is robust against deformations of the triple well potential. We introduce a basis of generalized number states including all contributing bands to explain the interband tunneling, and demonstrate various processes of interband tunneling and its robustness by numerically exact calculation.