Particle-hole asymmetry and brightening of solitons in a strongly repulsive Bose-Einstein condensate.


We study solitary wave propagation in the condensate of a system of hard-core bosons with nearest-neighbor interactions. For this strongly repulsive system, the evolution equation for the condensate order parameter of the system, obtained using spin-coherent state averages, is different from the usual Gross-Pitaevskii equation (GPE). The system is found to… (More)


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