Fractional ac Josephson effect in p- and d-wave superconductors

  title={Fractional ac Josephson effect in p- and d-wave superconductors},
  author={H J Kwon and K Sengupta and Victor M. Yakovenko},
  journal={The European Physical Journal B - Condensed Matter and Complex Systems},
For certain orientations of Josephson junctions between two px-wave or two d-wave superconductors, the subgap Andreev bound states produce a $4\pi$-periodic relation between the Josephson current I and the phase difference $\phi$: $I\propto\sin(\phi/2)$. Consequently, the ac Josephson current has the fractional frequency $eV/\hbar$, where V is the dc voltage. In the tunneling limit, the Josephson current is proportional to the first power (not square) of the electron tunneling amplitude. Thus… Expand
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