Strong field effects in the evolution of a two-level system

Evolution of a two-level system (TLS) in a strong resonant quantum field is considered beyond the rotating wave approximation (RWA). An analytical expression for the atomic population inversion that approximates numerical results with high accuracy is deduced. It allows us to describe new qualitativ...

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Bibliographic Details
Published in:Physics letters. A 2011-01, Vol.375 (3), p.385-389
Main Authors: Feranchuk, I.D., Leonov, A.V.
Format: Article
Language:English
Subjects:
Accuracy
Approximation
Collapse–revival
Evolution
Exact solutions
Mathematical analysis
Oscillations
Population inversion
Population oscillations
Rotating
Solid state physics
Strong quantum field
Suppression
Two-level system
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Summary:Evolution of a two-level system (TLS) in a strong resonant quantum field is considered beyond the rotating wave approximation (RWA). An analytical expression for the atomic population inversion that approximates numerical results with high accuracy is deduced. It allows us to describe new qualitative peculiarities of the TLS evolution in the strong field: i) suppression of the ‘collapse–revival’ effect, and ii) change of the spectrum and form of the population oscillations.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2010.11.009