Tuning the Josephson current in carbon nanotubes with the Kondo effect
A. Eichler, R. Deblock, M. Weiss, C. Karrasch, V. Meden, C. Schönenberger, H. Bouchiat
DOI 10.1103/PhysRevB.79.161407 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We investigate the Josephson current in a single wall carbon nanotube connected to superconducting electrodes. We focus on the parameter regime in which transport is dominated by Kondo physics. A sizeable supercurrent is observed for odd number of electrons on the nanotube when the Kondo temperature TK is sufficiently large compared to the superconducting gap. On the other hand when, in the center of the Kondo ridge, TK is slightly smaller than the superconducting gap, the supercurrent is found to be extremely sensitive to the gate voltage VBG. Whereas it is largely suppressed at the center of the ridge, it shows a sharp increase at a finite value of VBG. This increase can be attributed to a doublet-singlet transition of the spin state of the nanotube island leading to a π shift in the current phase relation. This transition is very sensitive to the asymmetry of the contacts and is in good agreement with theoretical predictions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ti/Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | onset |
Similar papers
Josephson current via spin and orbital states of a tunable double quantum dot
similarity 0.93Rousan Debbarma et al.
Source status unknown — claims are unverified
Vortex detection and quantum transport in mesoscopic graphene Josephson-junction arrays
similarity 0.92C. L. Richardson et al.
Source status unknown — claims are unverified
Manipulating the magnetic state of a carbon nanotube Josephson junction using the superconducting phase
similarity 0.92R. Delagrange et al.
Source status unknown — claims are unverified
Manipulation and Generation of Supercurrent in Out-of-Equilibrium Josephson Tunnel Nanojunctions
similarity 0.92S. Tirelli et al.
Source status unknown — claims are unverified
Quantum supercurrent transistors in carbon nanotubes
similarity 0.92Pablo Jarillo-Herrero et al. · 2006 · arXiv:cond-mat/0601434
Source status unknown — claims are unverified
Kondo resonance enhanced supercurrent in single wall carbon nanotube Josephson junctions
similarity 0.91K. Grove-Rasmussen et al. · 2006 · arXiv:cond-mat/0601371
Source status unknown — claims are unverified