dorsal/arxiv
View SchemaWeak localization of light by cold atoms: the impact of quantum internal structure
| Authors | Cord A. Mueller, Thibaut Jonckheere, Christian Miniatura, Dominique Delande |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0107030 |
| URL | https://arxiv.org/abs/quant-ph/0107030 |
| DOI | 10.1103/PhysRevA.64.053804 |
| Journal | Phys. Rev. A 64, 053804 (2001) |
Abstract
Since the work of Anderson on localization, interference effects for the propagation of a wave in the presence of disorder have been extensively studied, as exemplified in coherent backscattering (CBS) of light. In the multiple scattering of light by a disordered sample of thermal atoms, interference effects are usually washed out by the fast atomic motion. This is no longer true for cold atoms where CBS has recently been observed. However, the internal structure of the atoms strongly influences the interference properties. In this paper, we consider light scattering by an atomic dipole transition with arbitrary degeneracy and study its impact on coherent backscattering. We show that the interference contrast is strongly reduced. Assuming a uniform statistical distribution over internal degrees of freedom, we compute analytically the single and double scattering contributions to the intensity in the weak localization regime. The so-called ladder and crossed diagrams are generalized to the case of atoms and permit to calculate enhancement factors and backscattering intensity profiles for polarized light and any closed atomic dipole transition.
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"abstract": "Since the work of Anderson on localization, interference effects for the\npropagation of a wave in the presence of disorder have been extensively\nstudied, as exemplified in coherent backscattering (CBS) of light. In the\nmultiple scattering of light by a disordered sample of thermal atoms,\ninterference effects are usually washed out by the fast atomic motion. This is\nno longer true for cold atoms where CBS has recently been observed. However,\nthe internal structure of the atoms strongly influences the interference\nproperties. In this paper, we consider light scattering by an atomic dipole\ntransition with arbitrary degeneracy and study its impact on coherent\nbackscattering. We show that the interference contrast is strongly reduced.\nAssuming a uniform statistical distribution over internal degrees of freedom,\nwe compute analytically the single and double scattering contributions to the\nintensity in the weak localization regime. The so-called ladder and crossed\ndiagrams are generalized to the case of atoms and permit to calculate\nenhancement factors and backscattering intensity profiles for polarized light\nand any closed atomic dipole transition.",
"arxiv_id": "quant-ph/0107030",
"authors": [
"Cord A. Mueller",
"Thibaut Jonckheere",
"Christian Miniatura",
"Dominique Delande"
],
"categories": [
"quant-ph",
"cond-mat.dis-nn"
],
"doi": "10.1103/PhysRevA.64.053804",
"journal_ref": "Phys. Rev. A 64, 053804 (2001)",
"title": "Weak localization of light by cold atoms: the impact of quantum internal structure",
"url": "https://arxiv.org/abs/quant-ph/0107030"
},
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