Minigap, Parity Effect and Persistent Currents in SNS Nanorings

Details Minigap, Parity Effect and Persistent Currents in SNS Nanorings Minigap, Parity Effect and Persistent Currents in SNS Nanorings

2006-06-09

arxiv.org/abs/cond-mat/0606240v1

Phys. Rev. B 74, 184502 (2006)

Physics

Condensed Matter

Superconductivity

7 pages, 8 figures

Scientific paper

10.1103/PhysRevB.74.184502

We have evaluated a proximity-induced minigap in the density of states (DOS) of SNS junctions and SNS nanorings at an arbitrary concentration of non-magnetic impurities. We have demonstrated that an isotropic energy minigap in the electron spectrum opens up already at arbitrarily weak disorder, while angle resolved DOS at higher energies can remain strongly anisotropic. The minigap value $\epsilon_g$ can be tuned by passing a supercurrent through an SNS junction or by applying a magnetic flux $\Phi$ to an SNS ring. A non-monotonous dependence of $\epsilon_g$ on $\Phi$ has been found at weak disorder. We have also studied persistent currents in isolated SNS nanorings. For odd number of electrons in the ring we have found a non-trivial current-phase (current-flux) relation which -- at relatively high disorder -- may lead to a $\pi$-junction state and spontaneous currents in the ground state of the system.

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