SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems I
TT 6.3: Vortrag
Dienstag, 28. September 2021, 11:15–11:30, H7
Interplay of magnetism and Ising superconductivity: mirage gap and Josephson junction — •Gaomin Tang1, Raffael L. Klees2, Christoph Bruder1, and Wolfgang Belzig2 — 1Department of Physics, University of Basel, Switzerland — 2Fachbereich Physik, Universität Konstanz, Germany
Superconductivity is commonly destroyed by a magnetic field due to orbital or Zeeman-induced pair breaking. Surprisingly, the spin-valley locking in an Ising superconductor makes the superconducting state resilient to large magnetic fields. In the presence of an in-plane magnetic field, the emerging finite-energy pairing correlations manifest themselves in the occurrence of "mirage" gaps: at (high) energies of the order of the spin-orbit coupling strength, a gaplike structure in the spectrum emerges that mirrors the main superconducting gap. These mirage gaps are signatures of the equal-spin triplet finite-energy pairing correlations.
In a Josephson junction formed by two Ising superconductors that are in proximity to ferromagnetic layers, the supercurrent due to the triplet pairing correlations is controlled by the magnetic exchange fields. We show that both the charge and spin supercurrents can be modulated by the exchange fields.
[1] G. Tang, C. Bruder, W. Belzig, Phys. Rev. Lett. 126, 237001 (2021)