Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-05-07
New J Phys, 12, 083059 (2010)
Physics
Condensed Matter
Quantum Gases
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Scientific paper
10.1088/1367-2630/12/8/083059
We study the dynamics of Bose-Einstein condensates in accelerated two-dimensional optical square lattices by numerically solving the Gross-Pitaevskii equation. We consider the regime with negligible mean-field interactions and examine in detail the pulses of atom clouds ejected from the condensate due to Landau-Zener tunnelling. The pulses exhibit patterned structures that can be understood from the momentum-space dynamics of the condensate. Aside from conceiving realization of a pulsed two-dimensional atom laser, we demonstrate that, by exploring the band structure of the lattice, Landau-Zener tunnelling and Bragg reflection of the condensate inside the optical lattice can provide means for manipulation of coherent atom waves.
Han Dian-Jiun
Ting Wei-Chih
Wu Shin-Tza
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