Multiple dark-bright solitons in atomic Bose-Einstein condensates
  We present experimental results and a systematic theoretical analysis of dark-br ight soliton interactions and multiple-dark-bright soliton complexes in atomic t wo-component Bose-Einstein condensates. We study analytically the interactions b etween two-dark-bright solitons in a homogeneous condensate and, then, extend ou r considerations to the presence of the trap. An effective equation of motion is derived for the dark-bright soliton center and the existence and stability of stationary two-dark-bright soliton states is illustrated (with the bright components being either in- or out-of-phase). The equation of motion provides the characteristic oscillation frequencies of the solitons, in good agreement with the eigenfrequencies of the anomalous modes of the system. 
D. Yan, J.J. Chang, C. Hamner, P.G. Kevrekidis, P. Engels, V.   Achilleos, D.J. Frantzeskakis, R. Carretero-Gonzalez, and P....
cond-mat.quant-gas nlin.PS