Minisubbands in electron excitation spectra of layered short-coherence-length superconductors
S. E. Shafranjuk, T. Yamashita
DOI 10.1103/PhysRevB.54.15380 · Physical Review B
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Abstract
Quasiparticle excitation spectra of short-coherence-length layered superconductors (S̃) are considered as-suming a periodic alternation of the superconducting order parameter Δ(x) versus the lateral coordinate x in the c direction. The found self-consistent solution suggests that the electron-hole Andreev scattering in such a periodic Δ(x) causes the appearance of minisubbands in the electron spectrum of S̃, in a "clean" limit manifested as periodic spikes in the density of electron states at energies En=(2n+1)Δ0 (Δ0 is the energy gap amplitude; n is a natural number).
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