Solitonic Gluons
  We describe a physical mechanism for creating multi-soliton bound states where solitons are glued together by attraction between the beams they guide, `solitonic gluons'. We verify the concept of the solitonic gluons experimentally, observing a suppression of the repulsion between dark solitons due to an attractive force between bright guided beams. 
Elena A. Ostrovskaya, Yuri S. Kivshar, Zhigang Chen and Mordechai   Segev