Spontaneous decay of an atom excited in a dense and disordered atomic ensemble: Quantum microscopic approach

Abstract

On the basis of general theoretical results developed previously in [I. M. Sokolov et al., J. Exp. Theor. Phys. 112, 246 (2011)], we analyze spontaneous decay of a single atom inside cold atomic clouds under conditions when the averaged interatomic separation is less or comparable with the wavelength of quasi resonant radiation. Beyond the decay dynamics we analyze shifts of resonance as well as distortion of the spectral shape of the atomic transition.

Cooperative spontaneous decay of local excitation in a dense and disordered ensemble of point-like impurity atoms near a charged conductive surface

“…The atomic density was chosen n = 0.05. It is sufficiently large value, so that the dipole-dipole interaction plays a significant role for the atomic ensembles of such density in free space, without a surface [22]. The frequency ω is counted from the resonant frequency of the transition J = 0 ↔ J = 1, m = ±1 of a single atom, ω m=±1 .…”

Ramsey resonance of coherent population trapping in slow rubidium beam

“…We can also neglect resonance dipole-dipole interatomic interaction which causes noticeable shifts and distortion of atomic transitions in cold gases. [16][17][18] Thus when depicting the dynamics of atoms in the beam we can completely neglect interatomic interaction. It is convenient to describe internal atomic dynamics in the co-moving frame of reference.…”

Formation of plasmon pulses in the cooperative decay of excitons of quantum dots near a metal surface

“…Then, under the condition Γ a ≪ γ p , the rate of the radiative decay in a QD could be neglected for this problem. However, in the presence of a dense (about 10 15 cm −3 ensemble of adjacent excited chromophores, Γ a can significantly increase [23,24] in the initial stage of the system evolution due to dipole-dipole interactions. This can lead to the undesirable transfer of a part of chromophore energy to optical modes and can initiate the development of cooperative optical effects, including superradiation [8,25].…”