Proximity effect in superconducting heterostructures with strong spin-orbit coupling and spin splitting
Lu, Y., & Heikkilä, T. T. (2019). Proximity effect in superconducting heterostructures with strong spin-orbit coupling and spin splitting. Physical Review B, 100(10), Article 104514. https://doi.org/10.1103/PhysRevB.100.104514
Published inPhysical Review B
© 2019 American Physical Society
It has been shown that singlet Cooper pairs can be converted into triplet ones and diffuse into a ferromagnet over a long distance in a phenomenon known as the long-range proximity effect (LRPE). This happens in materials with inhomogeneous magnetism or spin-orbit coupling (SOC). Most of the previous studies focus on the cases with small SOC and exchange field. However, the physics was not clear when SOC and exchange field strength are both much greater than the disorder strength. In this work, we consider a two-dimensional system with a large Rashba-type SOC and exchange field in the case where only one band is partially occupied. We develop a generalized quasiclassical theory by projecting the Green function onto the partially occupied band (POB). We find that when the SOC energy scale is comparable with the exchange field, there is no LRPE. The reason is that the nonmagnetic impurities together with the large SOC and exchange field can effectively generate spin-flip scattering, which suppresses the proximity effect. We also show that when increasing either SOC or exchange field, the decay length of superconducting correlations can be significantly increased due to an approximately restored time reversal symmetry or spin rotation symmetry around the z (out-of-plane) axis. ...
PublisherAmerican Physical Society
Publication in research information system
MetadataShow full item record
Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThis work is supported by the Academy of Finland project HYNEQ (Project No. 317118).
Showing items with similar title or keywords.
Gauge theory of the long-range proximity effect and spontaneous currents in superconducting heterostructures with strong ferromagnets Bobkova, I. V.; Bobkov, A. M.; Silaev, Mikhail (American Physical Society, 2017)We present the generalized quasiclassical theory of the long-range superconducting proximity effect in heterostructures with strong ferromagnets, where the exchange splitting is of the order of Fermi energy. In the ferromagnet ...
Coupling the Higgs mode and ferromagnetic resonance in spin-split superconductors with Rashba spin-orbit coupling Lu, Yao; Ojajärvi, Risto; Virtanen, P.; Silaev, M. A.; Heikkilä, Tero T. (American Physical Society (APS), 2022)We show that the Higgs mode of superconductors can couple with spin dynamics in the presence of a static spin-splitting field and Rashba spin-orbit coupling. The Higgs-spin coupling dramatically modifies the spin susceptibility ...
Aikebaier, Faluke; Heikkilä, Tero T.; Lado, J. L. (American Physical Society (APS), 2022)Van der Waals heterostructures have risen as a tunable platform to combine different electronic orders, due to the flexibility in stacking different materials with competing symmetry broken states. Among them, van der Waals ...
Fermin, Remko; van Dinter, Dyon; Hubert, Michel; Woltjes, Bart; Silaev, Mikhail; Aarts, Jan; Lahabi, Kaveh (American Chemical Society (ACS), 2022)Since the discovery of the long-range superconducting proximity effect, the interaction between spin-triplet Cooper pairs and magnetic structures such as domain walls and vortices has been the subject of intense theoretical ...
Basset, J.; Kuzmanović, M.; Virtanen, P.; Heikkilä, T. T.; Estève, J.; Gabelli, J.; Strunk, C.; Aprili, M. (American Physical Society, 2019)By measuring the Josephson emission of a diffusive superconductor–normal metal–superconductor (SNS) junction we access the harmonic content of the current-phase relation (CPR). We experimentally identify a nonadiabatic ...