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Physica E Low-dimensional Systems and Nanostructures

Temperature dependence of atomic decay rate induced by the BEC of photons

Jian-Jun Zhang, Jianhui Yuan, Junpei Zhang, Ze Cheng

Published Aug 1, 2012• 6 citations
Publisher
DOI
10.1016/j.physe.2012.07.028

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We investigate the limitations arising from atomic collisions on the storage and delay times of probe pulses in electromagnetically induced transparency experiments. We find that the atomic collisions can be described by an effective decay rate that limits storage and delay times. We calculate the momentum and temperature dependence of the decay rate and find that it is necessary to excite atoms at a particular momentum depending on temperature and spacing of the energy levels involved in order to minimize the decoherence effects of atomic collisions.
We investigate thermally induced partial decay of a two-level atom into a photonic bandgap reservoir in regimes when the atomic transition is tuned in the forbidden gap or at the band edge. The atom decays into a quasi-equilibrium state different from those given by the Boltzmann statistical distribution. We take values of physical parameters typical for Rydberg atoms and currently existing photonic crystals. We show that specific thermally induced transitions can be significant for such Rydberg atoms even at bandgap frequencies provided that there is a peak in the density of modes at the band edge. We point out a temperature sensitivity of microwave quantum optics devices based on photonic band structures due to temperature-dependent transitions and level shifts in regimes when important quantum transitions occur at energies near to band-edge frequencies.