dorsal/arxiv
View SchemaTheory of coherent photoassociation of a Bose-Einstein condensate
| Authors | Marijan Kostrun, Matt Mackie, Robin Cote, Juha Javanainen |
|---|---|
| Categories | |
| ArXiv ID | physics/0006066 |
| URL | https://arxiv.org/abs/physics/0006066 |
| DOI | 10.1103/PhysRevA.62.063616 |
| Journal | Phys. Rev. A 62, 063616 (2000) (23 pages) |
Abstract
We study coherent photoassociation, phenomena analogous to coherent optical transients in few-level systems, which may take place in photoassociation of an atomic Bose-Einstein condensate but not in a nondegenerate gas. We develop a second-quantized Hamiltonian to describe photoassociation, and apply the Hamiltonian both in the momentum representation and in the position representation (field theory). Solution of the two-mode problem including only one mode each for the atomic and molecular condensates displays analogs of Rabi oscillations and rapid adiabatic passage. A classical version of the field theory for atoms and molecules is used to demonstrate that, in the presence of photoassociating light, a joint-atom molecule is unstable against growth of density fluctuations. Experimental complications, including spontaneous emission and unwanted "rogue" photodissociation from a photoassociated molecule are analyzed. A two-color Raman scheme is studied as a method to set up an effective two-mode scheme with reduced spontaneous emission losses. We discuss photoassociation rates and photoassociation Rabi frequencies for high-lying vibrational states in alkalis both on the basis of molecular-structure calculations, and by comparing with an experiment [Wynar et al., Science 287, 1016 (2000)].
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"abstract": "We study coherent photoassociation, phenomena analogous to coherent optical\ntransients in few-level systems, which may take place in photoassociation of an\natomic Bose-Einstein condensate but not in a nondegenerate gas. We develop a\nsecond-quantized Hamiltonian to describe photoassociation, and apply the\nHamiltonian both in the momentum representation and in the position\nrepresentation (field theory). Solution of the two-mode problem including only\none mode each for the atomic and molecular condensates displays analogs of Rabi\noscillations and rapid adiabatic passage. A classical version of the field\ntheory for atoms and molecules is used to demonstrate that, in the presence of\nphotoassociating light, a joint-atom molecule is unstable against growth of\ndensity fluctuations. Experimental complications, including spontaneous\nemission and unwanted \"rogue\" photodissociation from a photoassociated molecule\nare analyzed. A two-color Raman scheme is studied as a method to set up an\neffective two-mode scheme with reduced spontaneous emission losses. We discuss\nphotoassociation rates and photoassociation Rabi frequencies for high-lying\nvibrational states in alkalis both on the basis of molecular-structure\ncalculations, and by comparing with an experiment [Wynar et al., Science 287,\n1016 (2000)].",
"arxiv_id": "physics/0006066",
"authors": [
"Marijan Kostrun",
"Matt Mackie",
"Robin Cote",
"Juha Javanainen"
],
"categories": [
"physics.atom-ph",
"cond-mat.soft",
"cond-mat.stat-mech",
"physics.chem-ph",
"quant-ph"
],
"doi": "10.1103/PhysRevA.62.063616",
"journal_ref": "Phys. Rev. A 62, 063616 (2000) (23 pages)",
"title": "Theory of coherent photoassociation of a Bose-Einstein condensate",
"url": "https://arxiv.org/abs/physics/0006066"
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