title: Josephson current in carbon nanotubes with spin-orbit interaction.
abstract: We 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.
authors.affiliation: Departament de Física, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain.
authors.forename: Jong Soo
authors.initials: JS
authors.lastname: Lim
authors.forename: Rosa
authors.initials: R
authors.lastname: López
authors.forename: Ramón
authors.initials: R
authors.lastname: Aguado