π /2-Josephson junction as a topological superconductor

@article{Yang2018J,
  title={$\pi$
/2-Josephson junction as a topological superconductor},
  author={Zhesen Yang and Shengshan Qin and Qiang Zhang and Chen Fang and Jiangping Hu},
  journal={Physical Review B},
  year={2018}
}
We show that the time reversal symmetry inevitably breaks in a superconducting Josephson junction formed by two superconductors with different pairing symmetries dubbed as i-Josephson junction. While the leading conventional Josephson coupling vanishes in such an i-Josephson junction, the second order coupling from tunneling always generates chiral superconductivity orders with broken time reversal symmetry. Josephson frequency in the i-junction is doubled, namely $\omega = 4eV /h$. The result… 

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