Theory of the proximity effect in two-dimensional unconventional superconductors with Rashba spin-orbit interaction
Shun Tamura, Yukio Tanaka
DOI 10.1103/PhysRevB.99.184501 · Physical Review B
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Abstract
We study the anomalous proximity effect in diffusive normal metal (DN)/unconventional superconductor junctions, where the local density of states (LDOS) in the DN has a zero-energy peak due to the penetration of the odd-frequency spin-triplet s-wave pairing. In this study, we consider a two-dimensional unconventional superconductor on the substrate in the presence of a Rashba spin-orbit coupling (RSOC) λ, where the Rashba vector is parallel to the z direction. The anomalous proximity effect, originally predicted in spin-triplet p-wave superconductor junctions, is sensitive to the RSOC. It disappears with the increase of λ. On the other hand, the anomalous proximity effect can be switched on by the large λ values in the spin-singlet dxy-wave superconductor junctions. The resulting zero-energy LDOS and the magnitude of the odd-frequency spin-triplet s-wave pair amplitude increase with the increase of λ.
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