Fresnel aperture diffraction

A phase-sensitive probe of the pairing symmetry of a superconductor

C. S. Liu, Wen-Chin Wu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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(-kx,k ?)=Δ(kx,k?) with kx and k ? respectively the normal and parallel components of the electron Fermi wave vector, the quasiparticle FSAD pattern developed at the image plane is zeroth-order minimum if kxx=nπ (n is an integer and x is SC layer thickness). In contrast, if Δ(-kx,k?)=- Δ(kx,k?), the corresponding FSAD pattern is zeroth-order maximum. Observable consequences are discussed for iron-based superconductors of complex multiband pairings.

Original languageEnglish
Article number132508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number13
DOIs
Publication statusPublished - 2011 Apr 21

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Diffraction patterns
Superconducting materials
Diffraction
apertures
Fermi surface
Electrons
probes
Crystal symmetry
symmetry
diffraction
diffraction patterns
Fermi surfaces
integers
electrons
iron
Iron-based Superconductors

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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abstract = "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(-kx,k ?)=Δ(kx,k?) with kx and k ? respectively the normal and parallel components of the electron Fermi wave vector, the quasiparticle FSAD pattern developed at the image plane is zeroth-order minimum if kxx=nπ (n is an integer and x is SC layer thickness). In contrast, if Δ(-kx,k?)=- Δ(kx,k?), the corresponding FSAD pattern is zeroth-order maximum. Observable consequences are discussed for iron-based superconductors of complex multiband pairings.",
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