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Josephson Current in Carbon Nanotubes with Spin-Orbit Interaction

AuthorsLim, Jong-Soo ; López, Rosa ; Aguado, Ramón
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review Letters 107: 196801 (1-5) (2011)
AbstractWe demonstrate that curvature-induced spin-orbit coupling induces a 0-π transition in the Josephson current through a carbon nanotube quantum dot coupled to superconducting leads. In the noninteracting regime, the transition can be tuned by applying a parallel magnetic field near the critical field where orbital states become degenerate. Moreover, the interplay between charging and spin-orbit effects in the Coulomb blockade and cotunneling regimes leads to a rich phase diagram with well-defined (analytical) boundaries in parameter space. Finally, the 0 phase always prevails in the Kondo regime. Our calculations are relevant in view of recent experimental advances in transport through ultraclean carbon nanotubes.
DescriptionPACS numbers: 73.63.Fg, 71.70.Ej, 73.63.Kv, 74.45.+c
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.107.196801
Appears in Collections:(IFISC) Artículos
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