Time-reversal-invariant Z4 fractional Josephson effect.

  title={Time-reversal-invariant Z4 fractional Josephson effect.},
  author={Fan Zhang and C L Kane},
  journal={Physical review letters},
  volume={113 3},
We study the Josephson junction mediated by the quantum spin Hall edge states and show that electron-electron interactions lead to a dissipationless fractional Josephson effect in the presence of time-reversal symmetry. Surprisingly, the periodicity is 8π, corresponding to a Josephson frequency eV/2ℏ. We estimate the magnitude of interaction-induced many-body level splitting responsible for this effect and argue that it can be measured by using tunneling spectroscopy. For strong interactions we… CONTINUE READING


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