On a model of multiple andreev reflection at the interface «superconductor – carbon nanotube»

Abstract

Within the framework of Averin-Bardas model considering Breit-Wigner simulated current-voltage and dI dV -characteristics nanodevices, consisting of interface «superconductor – carbon nanotube» with parameters connection of the left ( Г_L ) and right electrodes ( Г_R ) carbon nanotube Г_L<Г_R. In the resulting characteristics terms was observed subharmonic gap structure at voltages V_n=2∆/en that occur as a result of the effect of multiple Andreev reflections in these structures. Subharmonic gap structure defined on dI dV - characteristics arise when n = 1, 2, 4, 6 in the form of peaks and when n = 3, 5, 7 as a minima. It is shown that in a high transparency of the barrier (0,95–0,98) nanocontact fifth, sixth and seventh Andreev features of the spectrum of the differential conductivity manifested in the form of a bend, and the eighth and ninth Andreev features are not observed. The results may be useful for calculating the elements of superconducting electronics. Keywords: multiple Andreev reflection, current-voltage characteristic, differential conductivity, subharmonic gap structures, differential resistance.