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摘要
The scattering matrix approach is applied to study tunneling spectra in normal metal/normal metal/ superconductor double junctions. The abnormal minigap in tunneling conductance is attributed to the phase coherence of electrons and Andreev- reflected holes in the middle metallic film. We consider a combination of the coherent tunneling with the sequential tunneling and the calculated results provide a reasonable explanation for the abnormal minigap observed in recent experiments.
- 出版日期2007-10
- 单位淮阴师范学院
