Rayleigh superradiance detuning asymmetry and light assisted collisions |
| TYPE | Condensed Matter Seminar |
| Speaker: | Nir Kampel |
| Affiliation: | Niels Bohr Institute |
| Date: | 12.03.2013 |
| Time: | 14:30 |
| Location: | Lidow Nathan Rosen (300) |
| Abstract: | Recently a surprising experimental result has showed that Rayleigh superradiance is detuning asymmetric [1]. The theory trying to explain the asymmetry [1,2] has been the source of a debate [3] about the actual origin of the asymmetry. Here we present our experimental data and an alternative explanation for the phenomenon [4]. By measuring the onset of Rayleigh superradiance, we get a sensitive monitor of the matter-wave coherence. We model the loss of coherence as an additional detuning dependent loss term in a rate equation type of model, typically used to describe Rayleigh superradiance. The additional loss term originates from the light assisted collisions followed by radiation trapping. We compare the experimental results to the model and find reasonable agreement. [1] L. Deng, et al., PRL, 105, 20404 (2010). [2] L. Deng, et al., PRL, 104, 050402 (2010). [3] W. Ketterle, PRL, 106, 118901 (2011); L. Deng, et al., PRL, 106, 118902 (2011). [4] N. S. Kampel, et at., PRL, 108, 090401 (2012). |