Physics – Quantum Physics
Scientific paper
2003-05-21
Phys. Rev. A 68, 043826 (2003)
Physics
Quantum Physics
9 pages, 5 figures, RevTeX4, to be published in Phys. Rev. A
Scientific paper
10.1103/PhysRevA.68.043826
The mutual dipole-dipole interaction of atoms in a trap can affect their fluorescence. Extremely large effects were reported for double jumps between different intensity periods in experiments with two and three Ba^+ ions for distances in the range of about ten wave lengths of the strong transition while no effects were observed for Hg^+ at 15 wave lengths. In this theoretical paper we study this question for configurations with three and four levels which model those of Hg^+ and Ba^+, respectively. For two systems in the Hg^+ configuration we find cooperative effects of up to 30% for distances around one or two wave lengths, about 5% around ten wave lengths, and, for larger distances in agreement with experiments, practically none. This is similar for two V systems. However, for two four-level configurations, which model two Ba^+ ions, cooperative effects are practically absent, and this latter result is at odds with the experimental findings for Ba^+.
Hannstein Volker
Hegerfeldt Gerhard C.
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