A1 Journal article (refereed)
Proximity effect in superconducting heterostructures with strong spin-orbit coupling and spin splitting (2019)


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


JYU authors or editors


Publication details

All authors or editors: Lu, Yao; Heikkilä, Tero T.

Journal or series: Physical Review B

ISSN: 2469-9950

eISSN: 2469-9969

Publication year: 2019

Volume: 100

Issue number: 10

Article number: 104514

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevB.100.104514

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/65943

Publication is parallel published: https://arxiv.org/abs/1905.11135


Abstract

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.


Keywords: superconductivity; superconductors; magnetism


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Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 2


Last updated on 2023-10-01 at 13:33