Fig. 3: LiFeAs scattering interference.
a Topograph recorded at a LiFeAs surface showing Fe-atom vacancies. The x-axis and the y-axis directions are along As–As directions. The orange circle denotes the type of weak scatterer we chose for our MAHAEM analysis. Inset shows the g(E) spectrum measured at a point for superconducting LiFeAs. The dashed rectangle represents the energy limits of the high-resolution dI/dV maps used herein for ρ−(q, E) analysis. b The Fermi surface model for LiFeAs showing three hole pockets h1, h2, and h3 around Γ-point and two electron pockets e1 and e2 around X-point in a 2-Fe zone. The scattering from hole-like to electron-like pockets takes place as indicated by a dashed vector qeh. c Theoretical prediction for single atom |\(\delta N({\mathbf{q}},E = 3.25\,{\mathrm{meV}})\)| using band- and gap-structure values fitted from experiments18. The electron-hole scattering near qeh appears as a “horn”-shaped feature which is enclosed by a circle. d Theoretical prediction for single atom ρ−(E) integrated over the circular region shown in Fig. 3c for both s± (black) and s++ (pink) symmetry.
