VORTEX DYNAMICS IN SUPERFLUIDS - CYCLOTRON-TYPE MOTION

Vortex dynamics in superfluids is investigated in the framework of the nonlinear Schrodinger equation. The natural motion of the vortex is o f cyclotron type, whose frequency is found to be on the order of the p honon velocity divided by the coherence length, and may be heavily dam ped due to phonon radiation. Trapping foreign particles into the vorte x core can reduce the cyclotron frequency and make the cyclotron motio n underdamped. The density fluctuations can follow the vortex motion a diabatically within the phonon wavelength at the cyclotron frequency, which results in a further downward renormalization of the cyclotron f requency. We have also discussed applications on the dynamics of vorti ces in superconducting films.