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arXiv · 1801.08689

i-Josephson Junction as Topological Superconductor

Zhesen Yang·Shengshan Qin·Qiang Zhang·Chen Fang·Jiangping Hu
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Abstract

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 provides a way to engineer topological superconductivity such as the d + id' -wave superconducting state characterized by a nonzero Chern number.

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Zhesen Yang, Shengshan Qin, Qiang Zhang, Chen Fang, Jiangping Hu. 2018-01-26. i-Josephson Junction as Topological Superconductor. https://doi.org/10.1103/physrevb.98.104515

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