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We have studied the collective excitation of fractional quantum Hall effect(FQHE) in the rotating Bose-Einstein condensate (BEC) using CF theory at thefilling fraction $\nu=1/2$. The roton type of excitation in the FQHE ofelectron system is established over the years for all the filling fraction,whereas the collective excitation at $\nu=1/2$ filling fraction in the rotatingBEC shows no roton minimum. We have investigated this using composite fermiontheory with the P$\ddot{o}$schl-Teller interaction potential between theparticles. We have seen that the long range interaction will give the roton,whereas short range interaction gives no roton minimum.

Roton minimum at $\nu=1/2$ filled fractional quantum Hall effect of Bose particles