Fresnel aperture diffraction: a phase-sensitive probe for superconducting pairing symmetry

Fresnel single aperture diffraction (FSAD) is proposed as a phase-sensitive probe for pairing symmetry and Fermi surface of a superconductor. We consider electrons injected, through a small aperture, into a thin superconducting (SC) layer. It is shown that in case of SC gap symmetry $Δ(-k_x,\mathbf{k}_\parallel)=Δ(k_x,\mathbf{k}_\parallel)$ with $k_x$ and $\mathbf{k}_\parallel$ respectively the normal and parallel component of electron Fermi wavevector, quasiparticle FSAD pattern developed at the image plane is zeroth-order minimum if $k_x x=nπ$ ($n$ is an integer and $x$ is SC layer thickness). In contrast, if $Δ(-k_x,\mathbf{k}_\parallel)=-Δ(k_x, \mathbf{k}_\parallel)$, the corresponding FSAD pattern is zeroth-order maximum. Observable consequences are discussed for iron-based superconductors of complex multi-band pairings.

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