ELECTROMAGNETIC RESPONSE OF A PANCAKE VORTEX IN HIGH-T-C SUPERCONDUCTORS

We calculate the linear response of the core of an isolated pancake vo rtex to an AC electric field. The field couples to the localized state s, continuum states, as well as to collective excitations of the super conducting condensate, which leads to a non-trivial dynamical response of the core. We use the Fermi-liquid theory of superconductivity to c alculate the current distribution induced by the AC field, and find pr onounced deviations from the current obtained in the Bardeen-Stephen m odel of the core. The field generates a vortex-antivortex pair inside the core of the equilibrium pancake vortex.