Nonclassical effects in cold trapped ions inside a cavity
  We investigate the dynamics of a cold trapped ion coupled to the quantized field inside a high-finesse cavity, considering exact resonance between the ionic internal levels and the field (carrier transition). We derive an intensity-dependent hamiltonian in which terms proportional to the square of the Lamb-Dicke parameter ($\eta$) are retained. We show that different nonclassical effects arise in the dynamics of the ionic population inversion, depending on the initial states of the vibrational motion/field and on the values of $\eta$. 
F.L. Semiao, A. Vidiella-Barranco, J.A. Roversi (Universidade Estadual   de Campinas, Brazil)