Super-mode spatial optical solitons in liquid crystals with competing   nonlinearities
  We study numerically formation of spatial optical solitons in nematic liquid crystals with competing nonlocal nonlinearities. We demonstrate that at the sufficiently high input power the interplay between focusing and thermally induced defocusing may lead to the formation of two-peak fundamental spatial solitons. These solitons have constant spatial phase and hence represent supermodes of the self-induced extended waveguide structure. We show that these two-peak solitons are stable in propagation and exhibit adiabatic transition to a single peak state under weak absorption. 
Pawel Jung and Wieslaw Krolikowski and Urszula A. Laudyn and Marek   Trippenbach and Miroslaw A. Karpierz
physics.optics