Dressed-state approach to a simple radiating atom

Abstract

We consider a system consisting of an atom in the dipole approximation, coupled to the electromagnetic field. Using recently introduced renormalized coordinates and dressed states, we give a non-perturbative solution to the atom radiation process. From this formalism a non-exponential decay law naturally emerges. However, at least for low frequencies and weak coupling, there is only a very small, practically non-detectable, deviation from a purely exponential decay, in agreement with all previous results in the literature.

Comments and references added, title changed, 8 pages 1 figure

References in corpus (6)

• An Exact Approach to the Oscillator Radiation Process in an Arbitrarily Large Cavity
• Boundary behaviour of the four-point function in the 3-dimensional Gross-Neveu model
• Dressed States Approach to Quantum Systems
• Stability of excited atoms in small cavities
• Nonequilibrium Dynamics of Coupled Quantum Systems
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Cited by in corpus (10)

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• Dressed-particle approach in the nonrelativistic classical limit
• Time evolution of a superposition of dressed oscillator states in a cavity
• Renormalized coordinate approach to the thermalization process
• Ground State Excitation of an Atom Strongly Coupled to a Free Quantum Field
• Behavior of a bipartite system in a cavity
• Thermal Effects on the Stability of Excited Atoms in Cavities
• Dressed (Renormalized) Coordinates in a Nonlinear System
• Uncertainty principle in a cavity at finite temperature
• The time evolution of an atom coupled to a thermal radiation field