Fig. 1: Germanene nanoribbon structure.
From: Realization of a one-dimensional topological insulator in ultrathin germanene nanoribbons
a Top- and side-view of germanene’s buckled honeycomb structure. Light and dark blue spheres represent the two vertically displaced sublattices. b The bandstructure of germanene with spin orbit coupling (SOC) (blue shaded area) and without SOC (dashed lines), depicting the topological gap and the two edge states with red and blue crossing the Fermi level. c Large-scale scanning tunneling microscope (STM) image of parallel germanene nanoribbons. Left side of the area has isolated nanoribbons, while the right side has an array of nanoribbons. The in-between regions are filled by nanowires and disorder domains (setpoints: 300 mV, 200 pA). The height scale of the image is 2.3 nm. d High-resolution image of several germanene nanoribbons recorded on a dense area (setpoints: −300 mV, 200 pA). The height scale of the image is 1.3 nm. e An atomic resolution STM image revealing the honeycomb lattice of the nanoribbon marked with a red square in panel c (setpoints: 50 mV, 200 pA). f Atomic resolution image of a germanene nanoribbon showing the honeycomb lattice and the zigzag termination (setpoints: −300 mV, 200 pA). g line profile recorded across the honeycomb lattice of the nanoribbon shown with the black dashed line in the inset, revealing a buckling of 0.35 Å. h Tentative structural model of germanene (red lattice) on Pt/Ge(110) substrate.
