A particle with a periodic angular coordinate undergoing free rotational motion interrupted by impulsive angular potentials. A single-period unitary combines free propagation and a position-dependent kick. Its momentum-space interference can give resonant ballistic growth or other transport regimes.
When the free angular-momentum phases all recur at the driving period, successive identical kicks add coherently. For the full revival and an initial zero-angular-momentum state, the kinetic energy after kicks is . This ballistic law is specific to the stated resonance and boundary conditions.
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