Trapping of Cold Excitons with Laser Light
  Optical trapping and manipulation of neutral particles has led to a variety of experiments from stretching DNA-molecules to trapping and cooling of neutral atoms. An exciting recent outgrowth of the technique is an experimental implementation of atom Bose-Einstein condensation. In this paper, we propose and demonstrate laser induced trapping for a new system--a gas of excitons in quantum well structures. We report on the trapping of a highly degenerate Bose gas of excitons in laser induced traps. 
A. T. Hammack, M. Griswold, L. V. Butov, L. E. Smallwood, A. L.   Ivanov, A. C. Gossard