Schönleber, D.W. Max Planck Society;
Gärttner, M., Whitlock, S., Schönleber, D., & Evers, J. (2014). Collective Excitation of Rydberg-Atom Ensembles beyond the Superatom Model. Physical Review Letters, 113(23): 233002. doi:10.1103/PhysRevLett.113.233002.