Shifts of a resonance line in a dense atomic sample

Javanainen, Juha and Ruostekoski, Janne and Li, Yi and Yoo, Sung-Mi (2014) Shifts of a resonance line in a dense atomic sample. Physical review letters, 112 (11). ISSN 1079-7114

Abstract

We study the collective response of a dense atomic sample to light essentially exactly using classical-electrodynamics simulations. In a homogeneously broadened atomic sample there is no overt Lorentz-Lorenz local field shift of the resonance, nor a collective Lamb shift. However, the addition of inhomogeneous broadening restores the usual mean-field phenomenology.