Effect of the counterrotating-wave terms on the spontaneous emission from a multilevel atom

Zheng Hong Li*, Da Wei Wang, Hang Zheng, Shi Yao ZHU, M. Suhail Zubairy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

The spontaneous decay of a multilevel atom interacting with the electromagnetic field in free space is investigated with a unitary transformation method, which is introduced in order to include all rotating and counter-rotating terms in the Hamiltonian. By using the ground state of the total Hamiltonian, the evolution of the effective decay rate and the energy shift are calculated. When the atomic transition frequency is smaller than the central frequency of the spectrum, the Zeno effect dominates, and if the atomic transition frequency is larger than the central frequency, the anti-Zeno effect will dominate. The time evolution of the energy shift is obtained. The counter-rotating terms lead to a shift toward the low frequency region for the frequency distribution of the emitted photon.

Original languageEnglish
Article number023801
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume80
Issue number2
DOIs
Publication statusPublished - 4 Aug 2009

Scopus Subject Areas

  • Atomic and Molecular Physics, and Optics

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