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

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

2004-06-25

arxiv.org/abs/cond-mat/0406633v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 6 figures

Scientific paper

10.1103/PhysRevB.70.245412

The influence of the impurity on the resonant Andreev reflection through a normal-metal/carbon-nanotube/superconductor system is studied theoretically. It is found that the resonant Andreev reflection depends on the strength of the impurity and the length of the armchair nanotube. The impurity which breaks the electron-hole symmetry of the nanotubes greatly reduces the resonant Andreev reflection. The symmetry broken depends distinctly on the impurity strength. The impurity effects on the Andreev reflection current at different bias are also studied.

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