Coupling of spatially separated carriers in crossed electric and magnetic fields and a possibility of a metastable superconducting state in bilayer systems

摘要

It is shown that in bilayer conducting structures in crossed electric andmagnetic fields of a special configuration (the fields should have oppositesigns in the adjacent layers) the dependence of the energy of a pair of equallycharged carriers on the momentum of the pair has a local minimum. This minimumcorresponds to a bound state of the pair. The local minimum is separated fromthe absolute minimum by a large energy barrier. That provides the stability ofthe bound state with respect to different scattering processes. If the numberof the pairs is macroscopic, a phase transition into a metastablesuperconducting state may take place.