Ginzburg-Landau equations and quantum coherent phenomena in systems with electron-hole pairing

A Ginzburg-Landau scheme is developed to describe nonuniform states of systems with pairing of spatially separated electrons and holes. The equations obtained are used to study current-carrying states in such systems. It is shown that electron tunneling from regions of electron to regions of hole conductivity does not suppress the flow of persistent currents. A new mechanism of superconductivity is predicted which is associated with degeneracy of layered structures of the type under consideration in the longitudinal velocity of electron-hole pairs. This mechanism is manifested in transverse superconductivity near the surface of the layered crystal.

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