Authors: A. Goban*, C. -L. Hung*, J. D. Hood*, S. -P. Yu*, J. A. Muniz, O. Painter, and H. J. Kimble
Journal Ref: arXiv:1503.04503 (2015); Phys. Rev. Lett. 115, 063601 (2015).
We report observations of superradiance for atoms trapped in the near field of a photonic crystal waveguide (PCW). By fabricating the PCW with a band edge near the D1 transition of atomic cesium, strong interaction is achieved between trapped atoms and guided-mode photons. Following short-pulse excitation, we record the decay of guided-mode emission and find a superradiant emission rate scaling as Γ_SR∝N⋅Γ_1D for average atom number 0.19≲N≲2.6 atoms, where Γ_1D/Γ_0=1.1±0.1 is the peak single-atom radiative decay rate into the PCW guided mode and Γ0 is the Einstein-A coefficient for free space. These advances provide new tools for investigations of photon-mediated atom-atom interactions in the many-body regime. See Synopsis: Atoms in a Photonic Trap Exhibit Superradiance