Fig. 2: The orientation-selected edge states of an NiI2 island measured with a W tip.
From: Orientation-selective spin-polarized edge states in monolayer NiI2
a STM image of monolayer NiI2 island with hexagonal shape (Vs = 0.3 V, Is = 100 pA). b Top view of ball model and high-resolution STM images of hexagonal NiI2 island terminated by Ni-edges and I-edges (Vs = 0.5 V, Is = 100 pA). The overlying atomic model is denoted by colors: Itop: blue; Ni: gray; Ibottom: yellow. c dI/dV spectra taken in the Ni-edge, interior terrace, and I-edge of the NiI2 island in (a). The gray arrow indicates the position of the edge state. d Spatially resolved dI/dV map along the black dotted lines shown in (a). e Vertically stacked dI/dV mappings of the same NiI2 island depending on different sample bias voltages.
