Quantum dynamics of impurities in a 1D Bose gas
  Using a species-selective dipole potential, we create initially localized impurities and investigate their interactions with a majority species of bosonic atoms in a one-dimensional configuration during expansion. We find an interaction-dependent amplitude reduction of the oscillation of the impurities' size with no measurable frequency shift, and study it as a function of the interaction strength. We discuss possible theoretical interpretations of the data. We compare, in particular, with a polaronic mass shift model derived following Feynman variational approach. 
J. Catani, G. Lamporesi, D. Naik, M. Gring, M. Inguscio, F. Minardi,   A. Kantian, T. Giamarchi
cond-mat.quant-gas