Rayleigh superradiance detuning asymmetry and light assisted collisions

TYPECondensed Matter Seminar
Speaker:Nir Kampel
Affiliation:Niels Bohr Institute
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
[4] N. S. Kampel, et at., PRL, 108, 090401 (2012).