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If strong electron-electron interactions between neighboring Fe atoms mediatethe Cooper pairing in iron-pnictide superconductors, then specific and distinctanisotropic superconducting energy gaps \Delta_i(k) should appear on thedifferent electronic bands i. Here we introduce intra-band Bogoliubovquasiparticle scattering interference (QPI) techniques for determination of\Delta_i(k) in such materials, focusing on LiFeAs. We identify the threehole-like bands assigned previously as \gamma, \alpha_2 and \alpha_1, and wedetermine the anisotropy, magnitude and relative orientations of their\Delta_i(k). These measurements will advance quantitative theoretical analysisof the mechanism of Cooper pairing in iron-based superconductivity.

Anisotropic Energy Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs