Strong anomalous proximity effect from spin-singlet superconductors

Satoshi Ikegaya; Jaechul Lee; Andreas P. Schnyder; Yasuhiro Asano

doi:10.1103/PhysRevB.104.L020502

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Strong anomalous proximity effect from spin-singlet superconductors

Satoshi Ikegaya, Jaechul Lee, Andreas P. Schnyder, Yasuhiro Asano

DOI 10.1103/PhysRevB.104.L020502 · Physical Review B

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Abstract

The proximity effect from a spin-triplet px-wave superconductor to a dirty normal-metal has been shown to result in various unusual electromagnetic properties, reflecting a cooperative relation between topologically protected zero-energy quasiparticles and odd-frequency Cooper pairs. However, because of a lack of candidate materials for spin-triplet px-wave superconductors, observing this effect has been difficult. In this paper, we demonstrate that the anomalous proximity effect, which is essentially equivalent to that of a spin-triplet px-wave superconductor, can occur in a semiconductor/high-Tc cuprate superconductor hybrid device in which two potentials coexist: A spin-singlet d-wave pair potential and a spin-orbit coupling potential sustaining the persistent spin-helix state. As a result, we propose an alternative and promising route to observe the anomalous proximity effect related to the profound nature of topologically protected quasiparticles and odd-frequency Cooper pairs.