Detecting sign-changing superconducting gap in LiFeAs using quasiparticle interference

Abstract

Using a realistic ten-orbital tight-binding model Hamiltonian fitted to the angle-resolved photoemission (ARPES) data on LiFeAs, we analyze the temperature, frequency, and momentum dependencies of quasiparticle interference (QPI) to identify gap sign changes in a qualitative way, following our original proposal [Phys. Rev. B 92, 184513 (2015)]. We show that all features present for the simple two-band model for the sign-changing $s_{+-}$-wave superconducting gap employed previously are still present in the realistic tight-binding approximation and gap values observed experimentally. We discuss various superconducting gap structures proposed for LiFeAs, and identify various features of these superconducting gaps functions in the quasiparticle interference patterns. On the other hand, we show that it will be difficult to identify the more complicated possible sign structures of the hole pocket gaps in LiFeAs, due to the smallness of the pockets and the near proximity of two of the gap energies.

10 pages, 13 figures

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Cited by in corpus (8)

• Effect of non-local correlations on the electronic structure of LiFeAs
• $k_z$ selective scattering within Quasiparticle Interference measurements of FeSe
• Phase-sensitive determination of nodal $\mathbf{d}$-wave order parameter in single-band and multiband superconductors
• Orbital-selective coherence-incoherence crossover and metal-insulator transition in Cu-doped NaFeAs
• Quasiparticle interference as a direct experimental probe of bulk odd-frequency superconducting pairing
• Quasi-one Dimensional Nanostructures as Sign of Nematicity in Iron Pnictides and Chalcogenides
• Multi-Atom Quasiparticle Scattering Interference for Superconductor Energy-Gap Symmetry Determination
• Revealing sign-reversal $s^{+-}$-wave pairing by quasiparticle interference in the heavy-fermion superconductor CeCu${}_2$Si${}_2$