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25/05/2017 - Long-range in light scattering by cold atoms - Palestrante: Romain Bachelard (DF-UFSCar)

Quando 25/05/2017
das 14h00 até 15h00
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Seminário de Probabilidade e Sistemas Complexos

Palestrante: Romain Bachelard (DF-UFSCar)

Local: Auditório Fávaro do ICMC.

Data e horário: Quinta feira, dia 25 de maio de 2017 às 14h.

Título: Long-range in light scattering by cold atoms

Abstract: The scattering of light by cold atomic clouds, and many over light scattering problems, is a long-range problem by nature. Indeed, the light creates an effective interaction between the particles, which presents the slow decay of waves over large distances. This allows  to reach  a  strong  'long-range'  coupling  between  the  particles,   a paradigmatic  example being  the mean-field  coupling of  atoms in 1D optical  cavities.  3D systems  also  exhibit  strong  inter-particle coupling, with a 1/r decay over long distances. As a result from this all-to-all strong coupling, a variety  of 'cooperative' effects were observed in light scattering  by atomic  clouds, that  are the  signatures of  the presence of macroscopic modes.  In this presentation, we will discuss such  cooperative  phenomena  in large  atomic  clouds, and the techniques and models to deal with them. These phenomena include superradiance and   subradiance, Mie scattering and cooperative radiation spectrum.

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