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Q: Fachverband Quantenoptik und Photonik
Q 17: Quantengase (Bosonische Gitter I)
Q 17.5: Vortrag
Dienstag, 20. März 2007, 11:30–11:45, 6J
Bloch-Oscillations Instability of a Bose-Einstein Condensate in an Optical Lattice — Andrey Kolovsky1,2, •Ming-Chiang Chung1, and Andreas Buchleitner1 — 1Max-Planck-Institut für Physik komplexer Systeme, D-01187 Dresden — 2Kirensky Institute of Physics, Ru-660036 Krasnoyarsk
We consider ultracold atoms prepared in the superfluid state, loaded into a 3D optical lattice, and exposed to a linear force, e.g., gravitation. If the linear force is large enough, it localizes the condensate in a 2D plane transverse to the gravitational field, what reduces the microscopic 3-D problem to a 1-D mean field problem. We derive the phase diagram for the quantum dynamics under these conditions, which exhibits a transition from stable to unstable Bloch oscillations. In the unstable regime, the Bloch oscillations decay irreversibly, while they persist in the stable regime.