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Tailoring of interference-induced surface superconductivity by an applied electric field
Nucleation of the pair condensate near surfaces above the upper critical magnetic field and the pair-condensate
enhancement/suppression induced by changes in the electron-phonon interaction at interfaces are the most
known examples of the surface superconductivity. Recently, another example has been reported when the surface
enhancement of the critical superconducting temperature occurs due to quantum interference. In this case the
pair states spread over the entire volume of the system while exhibiting the constructive interference near
the surface. In the present work we investigate how an applied electric field impacts the interference-induced
surface superconductivity. The study is based on a numerical solution of the self-consistent Bogoliubov-de
Gennes equations for a one-dimensional attractive Hubbard model. Our results demonstrate that the surface
superconducting characteristics, especially the surface critical temperature, are sensitive to the applied electric
field and can be tailored by changing its magnitude.