Signature of odd-frequency equal-spin triplet pairing in the Josephson current on the surface of Weyl nodal loop semimetals
Abstract
We theoretically predict proximity-induced odd-frequency (odd -ω ) pairing on the surface of a Weyl nodal loop semimetal, characterized by a nodal loop Fermi surface and drumheadlike surface states (DSSs), attached to conventional spin-singlet s -wave superconducting leads. Due to the complete spin polarization of the DSS, only odd -ω equal-spin triplet pairing is present, and we show that it gives rise to a finite Josephson current. Placing an additional ferromagnet in the junction can also generate odd -ω mixed-spin triplet pairing, but the pairing and current are not affected if the magnetization is orthogonal to the DSS spin polarization, which further confirms the equal-spin structure of the pairing.
- Publication:
-
Physical Review B
- Pub Date:
- September 2019
- DOI:
- 10.1103/PhysRevB.100.104511
- arXiv:
- arXiv:1902.10014
- Bibcode:
- 2019PhRvB.100j4511D
- Keywords:
-
- Condensed Matter - Superconductivity;
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Materials Science
- E-Print:
- 11 pages and 9 figures