dorsal/arxiv
View SchemaCold collisions in dissipative optical lattices
| Authors | J. Piilo, K. -A. Suominen |
|---|---|
| Categories | |
| ArXiv ID | physics/0411010 |
| URL | https://arxiv.org/abs/physics/0411010 |
| DOI | 10.1088/1464-4266/7/5/R01 |
| Journal | Journal of Optics B: Quantum and Semiclassical Optics 7, R37 - R52 (2005) |
Abstract
In the past, light-assisted cold collisions between laser cooled atoms have been widely studied in magneto-optical atom traps (MOTs). We describe here theoretical studies of dynamical interactions, specifically cold collisions, between atoms trapped in near-resonant, dissipative optical lattices. The developed quantum-mechanical model is based on Monte Carlo wave-function simulations and combines atomic cooling and collision dynamics in a single framework. It turns out, that the radiative heating mechanism affects the dynamics of atomic cloud in a red-detuned lattice in a way that is not directly expected from the MOT studies. The optical lattice and position dependent light-matter coupling introduces selectivity of collision partners. Atoms, which are most mobile and energetic, are strongly favored to participate in collisions, and are more often ejected from the lattice, than the slow ones in the laser parameter region selected for study. For blue-detuned lattices, we study how optical shielding emerges as a natural part of the lattice and look for ways to optimize the effect. The simulations are computationally very demanding and would obviously benefit from the simplification schemes. We present some steps to this direction by showing how it is possible to calculate collision rates in near-resonant lattices in a fairly simple way.
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"abstract": "In the past, light-assisted cold collisions between laser cooled atoms have\nbeen widely studied in magneto-optical atom traps (MOTs). We describe here\ntheoretical studies of dynamical interactions, specifically cold collisions,\nbetween atoms trapped in near-resonant, dissipative optical lattices. The\ndeveloped quantum-mechanical model is based on Monte Carlo wave-function\nsimulations and combines atomic cooling and collision dynamics in a single\nframework. It turns out, that the radiative heating mechanism affects the\ndynamics of atomic cloud in a red-detuned lattice in a way that is not directly\nexpected from the MOT studies. The optical lattice and position dependent\nlight-matter coupling introduces selectivity of collision partners. Atoms,\nwhich are most mobile and energetic, are strongly favored to participate in\ncollisions, and are more often ejected from the lattice, than the slow ones in\nthe laser parameter region selected for study. For blue-detuned lattices, we\nstudy how optical shielding emerges as a natural part of the lattice and look\nfor ways to optimize the effect. The simulations are computationally very\ndemanding and would obviously benefit from the simplification schemes. We\npresent some steps to this direction by showing how it is possible to calculate\ncollision rates in near-resonant lattices in a fairly simple way.",
"arxiv_id": "physics/0411010",
"authors": [
"J. Piilo",
"K. -A. Suominen"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1088/1464-4266/7/5/R01",
"journal_ref": "Journal of Optics B: Quantum and Semiclassical Optics 7, R37 - R52\n (2005)",
"title": "Cold collisions in dissipative optical lattices",
"url": "https://arxiv.org/abs/physics/0411010"
},
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