Impurity effects on resonant Andreev reflection in a finite-sized carbon nanotube system
Hui Pan, Tsung-Han Lin, Dapeng Yu
DOI 10.1103/PhysRevB.70.245412 · Physical Review B
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Abstract
The impurity effects on resonant Andreev reflection through a normal-metal/carbon-nanotube/superconductor system are studied theoretically. The Andreev reflection current versus gate voltage clearly shows that the impurity can break the electron-hole symmetry in nanotubes, and the symmetry broken depends distinctly on the impurity strength. The length of the armchair nanotube can cause the on-resonance and off-resonance behavior of the Andreev reflection. For the on-resonance case, the impurity narrows the distribution of the Andreev reflection probability and decreases the current, while for the off-resonance case, the impurity enhances the Andreev reflection probability and increases the current.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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