Turning light into a liquid via atomic coherence
  We study a four level atomic system with electromagnetically induced transparency with giant $\chi^{(3)}$ and $\chi^{(5)}$ susceptibilities of opposite signs. This system would allow to obtain multidimensional solitons and light condensates with surface tension properties analogous to those of usual liquids. 
Humberto Michinel, Maria J. Paz Alonso, Victor M. Perez-Garcia