Two papers were finished recently on the subject of recoilless scattering from a gas and scattering from atoms in an optical lattice as a probe of the quantum state of the lattice.
Gorshkov, A. M. Rey, A. J. Daley, M. M. Boyd, J. Ye, P. Zoller, and M. D. Lukin, Alkaline-Earth-Metal Atoms as Few Qubit Quantum Registers, Phys. Rev. Lett. 102, 110503 (2009).
L. Jiang, A. M. Rey, O. Romero-Isart, J. J. Garcia-Ripoli, A. Sampera, and M. D. Lukin, Preparation of decoherence-free cluster states with optical superlattices, Phys. Rev. A 79, 022309 (2009).
T. Hong, A. Gorshkov, D. Patterson, A. S. Zibrov, J. M. Doyle, M. D. Lukin, and M. G. Prentiss, Realization of coherent optically dense media via buffer-gas cooling, Phys. Rev. A 79, 013806 (2009).
Observation of Cold Collisions between Trapped Ions and Trapped Atoms. A. Grier, M. Cetina, F. Orucevic, and V. Vuletic, Phys. Rev. Lett. 102, 223201 (2009).