Abstract
The single-particle excitation spectrum and the density of states (DOS) for a superconducting bilayer composite are calculated by solving the Bogoliubov equations. The bilayer consists of two different superconducting films in contact. The superconducting order parameters of the films Δ1 and Δ2 are assumed constant. For various film thicknesses the dependence of the DOS on the ratio Δ1/Δ2 is shown. This dependence is most prominent for states with excitation energy ɛ less than Δ2.
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Yoksan, S., Nagi, A.D.S. Excitation spectrum and the density of states for a superconducting bilayer composite. J Low Temp Phys 66, 115–125 (1987). https://doi.org/10.1007/BF00681471
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DOI: https://doi.org/10.1007/BF00681471