Parity-Affected Persistent Currents in Superconducting Nanorings

Details Parity-Affected Persistent Currents in Superconducting Nanorings Parity-Affected Persistent Currents in Superconducting Nanorings

2004-01-19

arxiv.org/abs/cond-mat/0401338v2

Physical Review B 71, 014518 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Published version

Scientific paper

10.1103/PhysRevB.71.014518

We argue that at sufficiently low temperatures T superconducting parity effect may strongly influence equilibrium persistent currents (PC) in isolated superconducting nanorings containing a weak link with few conducting modes. For a single channel quantum point contact at T=0 we predict a novel effect of parity-induced blocking of PC. In nanorings with SNS junctions a $\pi$-state can occur for the odd number of electrons. Changing this number from even to odd yields spontaneous supercurrent in the ground state of such rings without any externally applied magnetic flux.

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