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Mechanism of the electric-field-induced vortex drift in excitable media.

A vortex behavior in an electric field is shown to depend strongly on the elongation and contraction of the vortex tip. The wave width of the rotating vortex tip is periodically modulated: it increases (decreases) when the tip propagates to the positive (negative) electrode. This affects the elongation of the vortex tip, resulting in a perpendicular component of the drift defined by chirality of the vortex. A kinematic model is formulated where the elongation of a wave break is explicitly defined by the wave width, and its behavior is compared with the numerical calculations of reaction-diffusion equations