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Spontaneous Emission of an Atom Near an Oscillating Mirror

1
Department of Physics, Paderborn University, Warburger Strasse 100, D-33098 Paderborn, Germany
2
Dipartimento di Fisica e Chimica—Emilio Segrè, Università degli Studi di Palermo, Via Archirafi 36, I-90123 Palermo, Italy
3
INFN, Laboratori Nazionali del Sud, I-95123 Catania, Italy
*
Author to whom correspondence should be addressed.
Symmetry 2019, 11(11), 1384; https://doi.org/10.3390/sym11111384
Received: 19 October 2019 / Revised: 3 November 2019 / Accepted: 5 November 2019 / Published: 8 November 2019
We investigate the spontaneous emission of one atom placed near an oscillating reflecting plate. We consider the atom modeled as a two-level system, interacting with the quantum electromagnetic field in the vacuum state, in the presence of the oscillating mirror. We suppose that the plate oscillates adiabatically, so that the time-dependence of the interaction Hamiltonian is entirely enclosed in the time-dependent mode functions, satisfying the boundary conditions at the plate surface, at any given time. Using time-dependent perturbation theory, we evaluate the transition rate to the ground-state of the atom, and show that it depends on the time-dependent atom–plate distance. We also show that the presence of the oscillating mirror significantly affects the physical features of the spontaneous emission of the atom, in particular the spectrum of the emitted radiation. Specifically, we find the appearance of two symmetric lateral peaks in the spectrum, not present in the case of a static mirror, due to the modulated environment. The two lateral peaks are separated from the central peak by the modulation frequency, and we discuss the possibility to observe them with actual experimental techniques of dynamical mirrors and atomic trapping. Our results indicate that a dynamical (i.e., time-modulated) environment can give new possibilities to control and manipulate also other radiative processes of two or more atoms or molecules nearby, for example their cooperative decay or the resonant energy transfer. View Full-Text
Keywords: spontaneous emission; dynamical environments; cavity quantum electrodynamics spontaneous emission; dynamical environments; cavity quantum electrodynamics
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MDPI and ACS Style

Ferreri, A.; Domina, M.; Rizzuto, L.; Passante, R. Spontaneous Emission of an Atom Near an Oscillating Mirror. Symmetry 2019, 11, 1384.

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