Fig. 2: Electronic states at the (11) edge of single-layer FeSe.
From: Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states
a STM topographic image (Vs = 1 V, It = 50 pA) of the (11) edge. Inset: atomically resolved image (Vs = 50 mV, It = 500 pA) of FeSe. b Two sets of tunneling spectra measured along the blue and red arrows in (a). The data are vertically shifted in the direction of the corresponding colored arrows for clarity. The black lines indicate individual zero conductance. c, d Energy gap map (c) and zero-bias conductance (dI/dV(0)) map (d) obtained from the spectroscopic mapping over the area outlined by the black dashed box in (a). The purple circles mark the origin point. The white boxes in (a), (c), and (d) mark local defects and the anomalies in Δ and dI/dV(0) induced by these defects, respectively. e Raw and normalized column-averaged zero-bias conductance as a function of the distance to the (11) edge. The normalization method is described in Supplementary Note 1. The error bar refers to the standard error and its value has been doubled for clarity.
