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The consequences of the Schwinger effect for conductivity is computed forstrong coupling systems using holography. The one loop diagram on the flavorbrane introduces an $O({\lambda \over N_c})$ imaginary part in the effectiveaction for a Maxwell flavor gauge field. This in turn introduces a realconductivity in an otherwise insulating phase of the boundary theory. Moreoverin certain regions of parameter space the differential conductivity isnegative. This is computed in the context of the Sakai-Sugimoto model.

Schwinger Effect and Negative Differential Conductivity in Holographic Models