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The influence of the impurity on the resonant Andreev reflection through anormal-metal/carbon-nanotube/superconductor system is studied theoretically. Itis found that the resonant Andreev reflection depends on the strength of theimpurity and the length of the armchair nanotube. The impurity which breaks theelectron-hole symmetry of the nanotubes greatly reduces the resonant Andreevreflection. The symmetry broken depends distinctly on the impurity strength.The impurity effects on the Andreev reflection current at different bias arealso studied.Comment: 9 pages, 6 figure

Impurity effects on resonant Andreev reflection in a finite-sized carbon nanotube system