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arXiv 1303.7249physics.atom-phcond-mat.quant-gasquant-ph
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光在有磁场的冷原子云中的多次光的散射散射

Multiple scattering of light in cold atomic clouds with a magnetic field

Olivier Sigwarth, Guillaume Labeyrie, Dominique Delande, Christian Miniatura

摘要:

从原子散射体的微观理论出发,描述了光在单原子上的光的散射,研究了光在有磁场B存在的冷原子云中的介观相干传播。给出了磁光效应和光学各向异性在B中的非微扰表达式。然后,我们考虑多次散射制度和解决的相干后向散射(CBS)效应的命运。结果表明,对于自旋为非零的原子,其基态的CBS干涉衬度比B=0时的值有所增加,这一结果与经典样品不同。我们验证我们的理论结果与实验数据的定量比较。

英文摘要:

Starting from a microscopic theory for atomic scatterers, we describe the scattering of light by a single atom and study the coherent propagation of light in a cold atomic cloud in the presence of a magnetic field B in the mesoscopic regime. Non-pertubative expressions in B are given for the magneto-optical effects and optical anisotropy. We then consider the multiple scattering regime and address the fate of the coherent backscattering (CBS) effect. We show that, for atoms with nonzero spin in their ground state, the CBS interference contrast can be increased compared to its value when B=0, a result at variance with classical samples. We validate our theoretical results by a quantitative comparison with experimental data.

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