2017/04/16 by Dheeraj Kumar Singh, Pinaki Majumdar
Materials Science · Physics and Astronomy · #Angle-resolved photoemission spectroscopy #Anisotropy #Antiferromagnetism #Condensed matter physics #Electronic structure #Impurity #Iron-based superconductors research #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quasiparticle #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.96.235111
published as Phys. Rev. B 96, 235111 (2017)
arxiv created 2017/04/16 · openalex publication_date 2017/12/08 · arxiv updated 2017/12/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the impurity-scattering-induced quasiparticle interference in the (\ensuremathπ,0) spin-density wave phase of the iron pnictides. We use a five-orbital tight-binding model and our mean-field theory in the clean limit captures key features of the Fermi surface observed in angle-resolved photoemission. We use a t-matrix formalism to incorporate the effect of doping-induced impurities on this state. The impurities lead to a spatial modulation of the local density of states about the impurity site, with a periodicity of \ensuremath∼8a_Fe\ensuremath-Fe along the antiferromagnetic direction. The associated momentum space quasiparticle interference pattern is anisotropic, with major peaks located at \ensuremath∼(\ifmmode±\else\textpm\fi\ensuremathπ/4,0), consistent with spectroscopic imaging scanning tunneling microscopy. We trace the origin of this pattern to an elliptical contour of constant energy around momentum (0,0), with major axis oriented along the (0,1) direction, in the mean-field electronic structure.