Conductance properties of nanotubes coupled to superconducting leads: signatures of Andreev states dynamics

Abstract

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Gate-Controlled Superconductivity in a Diffusive Multiwalled Carbon Nanotube

“…4, the supercurrent peak near zero bias starts to develop before any signs of higher order Andreev peaks. This seems to contradict with the scenario of Vecino et al [8] who argue that inelastic processes enhance conductance due to higher order MAR processes and lead to IV curves with hysteresis at small bias.…”

“…Enhanced conductance was observed by Buitelaar et al [7] near zero bias, which was interpreted in terms of multiple Andreev reflections (MAR) in the presence of inelastic processes [8]. Similar results were obtained by Kasumov et al [3].…”

Josephson current through randomly oriented CNTs

“…On the other hand, in some experiments the zero bias conductance was observed to increase, though no supercurrents were reported [25]. Similar results were obtained for multiwall carbon nanotubes [22,26,27]. Initial experimental study in our group showed that the critical current in cuprate superconductors increases when they were mixed with CNTs.…”

Kondo resonance enhanced supercurrent in single wall carbon nanotube Josephson junctions

“…A similar analysis of a zero bias conductance peak as supercurrent has successfully been carried out for an open quantum dot [11], i.e., without Coulomb blockade effects. We note that an alternative interpretation of the origin of the zero bias peak based on quasiparticle current (multiple Andreev reflections) with a cut-off for higher order multiple Andreev reflection processes has also been suggested [31], but in this article the supercurrent interpretation will be pursued. The value of the measured supercurrent is The suppression is partly explained within an extended resistively and capacitively shunted junction model due to interaction of the SWCNT Josephson junction with its electrical environment.…”