Collisional de-excitation in a quasi-2D degenerate Bose gas

Details Collisional de-excitation in a quasi-2D degenerate Bose gas Collisional de-excitation in a quasi-2D degenerate Bose gas

2005-09-03

arxiv.org/abs/cond-mat/0509079v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figres

Scientific paper

We separate a Bose-Einstein condensate into an array of 2D sheets using a 1D optical lattice, and then excite quantized vibrational motion in the direction normal to the sheets. Collisions between atoms induce vibrational de-excitation, transferring the large excitation energy into back-to-back outgoing atoms, imaged as rings in the 2D plane. The ring diameters correspond to vibrational energy level differences, and edge-on imaging allows identification of the final vibrational states. Time dependence of these data provides a nearly complete characterization of the decay process including the energies, populations, and lifetimes of the lowest two excited vibrational levels. The measured decay rates represent a suppression of collisional de-excitation due to the reduced dimensionality, a matter wave analog to inhibited spontaneous emission.

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