Observation of a red-blue detuning asymmetry in matter-wave superradiance

Details Observation of a red-blue detuning asymmetry in matter-wave superradiance Observation of a red-blue detuning asymmetry in matter-wave superradiance

2010-06-07

arxiv.org/abs/1006.1295v3

Physics

Condensed Matter

Quantum Gases

Accepted by Phys. Rev. Lett

Scientific paper

We report the first experimental observations of strong suppression of matter-wave superradiance using blue-detuned pump light and demonstrate a pump-laser detuning asymmetry in the collective atomic recoil motion. In contrast to all previous theoretical frameworks, which predict that the process should be symmetric with respect to the sign of the pump-laser detuning, we find that for condensates the symmetry is broken. With high condensate densities and red-detuned light, the familiar distinctive multi-order, matter-wave scattering pattern is clearly visible, whereas with blue-detuned light superradiance is strongly suppressed. In the limit of a dilute atomic gas, however, symmetry is restored.

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