Unlike weakly interacting BEC, solitons in hard core bosonic gases support both dark and bright solitons .solitary waves.These solitons survive collision and quantum fluctuations.
- “Quantum Dynamics of Solitons in Strongly Interacting Systems on Optical Lattices”, Chester P. Rubbo, Indubala I. Satija, William P. Reinhardt, Radha Balakrishnan,Ana Maria Rey,1 and Salvatore R. Manmana , Phys. Rev. A 85, 053617 (2012) (PDF)
- “Particle-hole Asymmetry and Brightening of Soliton in a Strongly Repulsive BEC”, Radha Balakrishnan, Indubala Satija and Charles Clark, Phys Rev Lett, 103, 230403, 2009 (PDF)