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Chiral symmetry breaking and the Josephson current in a ballistic superconductor-quantum wire-superconductor junction

Ilya V. Krive ; Leonid Y. Gorelik (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Robert I. Shekhter (Institutionen för fysik (GU) ; Institutionen för teknisk fysik) ; Mats Jonson (Institutionen för fysik (GU) ; Institutionen för teknisk fysik, Kondenserade materiens teori)
Fizika Nizkikh Temperatur (0132-6414). Vol. 30 (2004), 5, p. 535-543.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Semiconductor quantum wires, Semiconductor junctions, Josephson junction devices, Resonance, Electrons, Nanostructured materials, Carbon nanotubes, Electric potential, Spectrum analysis



Denna post skapades 2007-10-24. Senast ändrad 2013-07-17.
CPL Pubid: 56908

 

Institutioner (Chalmers)

Institutionen för fysik (GU) (GU)
Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)
Institutionen för teknisk fysik (1900-2015)

Ämnesområden

Fysik

Chalmers infrastruktur