Chiral symmetry breaking and the Josephson current in a ballistic superconductor-quantum wire-superconductor junction
Artikel i vetenskaplig tidskrift, 2004

We evaluate the Josephson current through a quasi-1D quantum wire coupled to bulk superconductors. It Is shown that the interplay of Rashba spin-orbit interaction and Zeeman splitting results in the appearence of a Josephson current even in the absence of any phase difference between the superconductors. In a transparent junction (D [asymptotically equal to] 1) at low temperatures this anomalous supercurrent Jan appears abruptly for a Zeeman splitting of the order of the Andreev level spacing as the magnetic field is varied. In a low transparency (D very much less than 1) junction one has Jan α root D under special (resonance) conditions. In the absence of Zeeman splitting the anomalous supercurrent disappears. We have investigated the influence of dispersion asymmetry induced by the Rashba interaction in quasi-1D quantum wires on the critical Josephson current and have shown that the breakdown of chiral symmetry enhances the supercurrent.

Josephson junction devices

Carbon nanotubes

Spectrum analysis

Semiconductor junctions

Resonance

Electrons

Semiconductor quantum wires

Nanostructured materials

Electric potential

Författare

Ilya V. Krive

Göteborgs universitet

Leonid Gorelik

Chalmers, Teknisk fysik, Kondenserade materiens teori

Robert I. Shekhter

Göteborgs universitet

Chalmers, Teknisk fysik

Mats Jonson

Chalmers, Teknisk fysik, Kondenserade materiens teori

Göteborgs universitet

Fizika Nizkih Temperatur

0132-6414 (ISSN) 1816-0328 (eISSN)

Vol. 30 535-543

Ämneskategorier

Fysik