Journal
PHYSICAL REVIEW B
Volume 98, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.104515
Keywords
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Funding
- Ministry of Science and Technology of China 973 program [2015CB921300, 2017YFA0303100]
- National Science Foundation of China [NSFC-1190020, 11534014, 11334012]
- Strategic Priority Research Program of CAS [XDB07000000]
- Key Research Program of the CAS [XDPB08-1]
- International Young Scientist Fellowship of Institute of Physics CAS [2017002]
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Superconducting states with broken time-reversal symmetry are rarely found in nature. Here we predict that it is inevitable that the time-reversal symmetry is broken spontaneously in a superconducting Josephson junction formed by two superconductors with different pairing symmetries dubbed as pi/2-Josephson junction. While the leading conventional Josephson coupling vanishes in such an pi/2-Josephson junction, the second-order coupling from tunneling always generates chiral superconductivity orders with broken time-reversal symmetry. Josephson frequency in the pi/2 junction is doubled, namely omega = 4eV/h. The result can not only provide a way to engineer topologically trivial or nontrivial time-reversal breaking superconducting states, but also be used to determine the pairing symmetry of unconventional superconductors.
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