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Observation of Suppression of Light Scattering Induced by Dipole-Dipole Interactions in a Cold-Atom Ensemble

Abstract : We study the emergence of collective scattering in the presence of dipole-dipole interactions when we illuminate a cold cloud of rubidium atoms with a near-resonant and weak intensity laser. The size of the atomic sample is comparable to the wavelength of light. When we gradually increase the number of atoms from 1 to ∼450, we observe a broadening of the line, a small redshift and, consistently with these, a strong suppression of the scattered light with respect to the noninteracting atom case. We compare our data to numerical simulations of the optical response, which include the internal level structure of the atoms.
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J Pellegrino, R Bourgain, Stephan Jennewein, Yvan R. P. Sortais, Antoine Browaeys, et al.. Observation of Suppression of Light Scattering Induced by Dipole-Dipole Interactions in a Cold-Atom Ensemble. Physical Review Letters, American Physical Society, 2014, 113, pp.133602 ⟨10.1103/PhysRevLett.113.133602⟩. ⟨hal-00949944⟩

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