Abstract
We investigate the Wigner-Weisskopf decay of a two level atom in front
of an oscillating mirror. This work builds on and extends previous
theoretical and experimental studies of the effects of a static mirror
on spontaneous decay and resonance fluorescence. The spontaneously
emitted field is inherently non-stationary due to the time-dependent
boundary conditions and in order to study its spectral distribution we
employ the operational definition of the spectrum of non-stationary
light due to the seminal work by Eberly and Wodkiewicz. We find a rich
dependence of this spectrum as well as of the effective decay rates and
level shifts on the mirror-atom distance and on the amplitude and
frequency of oscillations of the mirror. The results presented here
provide the basis for future studies of more complex setups, where the
motion of the atom and/or the mirror are included as quantum degrees of
freedom.
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