A Two-Atom Picture of Coherent Atom-Molecule Quantum Beats
| Autor: | Chris H. Greene, Bogdan Borca, Doerte Blume |
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| Rok vydání: | 2003 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases SIMPLE (dark matter experiment) Condensed Matter (cond-mat) General Physics and Astronomy FOS: Physical sciences Condensed Matter Magnetic field Trap (computing) Quantum beats Atom Physics::Atomic and Molecular Clusters Molecule Physics::Atomic Physics Atomic physics Feshbach resonance Scaling |
| DOI: | 10.48550/arxiv.cond-mat/0304341 |
| Popis: | A simple two-atom model is shown to describe a Bose-Einstein condensate of alkali atoms subjected to external magnetic field ramps near a Feshbach resonance. The implications uncovered for two atoms in a trap can be applied at least approximately to a many-atom condensate. A connection to observations is accomplished by scaling the trap frequency to achieve a density comparable to that of the experiments, which yields the fraction of atom pairs in the gas that become molecules. A sudden approximation is used to model the external magnetic field ramps in the vicinity of a two-body Feshbach resonance. The results of this model are compared with recent experimental observations of Donley et al. [1]. Comment: 16 pages, 5 figures; Submitted to the New. J. Phys. Focus Issue on Quantum Gases; Revision: changed the formula for the scaled frequency and the numerical results in Sec. 5, Replaced figures 2-5 |
| Databáze: | OpenAIRE |
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