Collective Enhancement and Suppression of Excitation Decay in Optical Lattices

Details Collective Enhancement and Suppression of Excitation Decay in Optical Lattices Collective Enhancement and Suppression of Excitation Decay in Optical Lattices

2009-10-23

arxiv.org/abs/0910.4501v1

EPL 90, 23001 (2010).

Physics

Quantum Physics

4 pages, 7 figures

Scientific paper

10.1209/0295-5075/90/23001

We calculate radiative lifetimes of collective electronic excitations of atoms in an infinite one dimensional lattice. The translational symmetry along the lattice restricts the photon wave vector component parallel to the lattice to the exciton wave number and thus the possible emission directions. The resulting radiation damping rate and emission pattern of the exciton strongly deviates from independent atom. For some wave numbers and polarizations the excitons superradiantly decay very fast, while other excitons show zero radiation damping rate and form propagating meta-stable excitations. Such states could be directly coupled via tailored evanescent fields from a nearby fiber.

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