Fig. 2: Experimental realization of a trimer chain.
From: Tuneable topological domain wall states in engineered atomic chains
a Stacked contour plot of dI/dV spectra taken along a trimer chain. The chain topography is shown on top for reference (bias 0.5 V, current 1 nA). b STM topography of trimer (top), experimental dI/dV and simulated LDOS maps at the biases indicated in the figure. dI/dV maps are recorded in the constant-height mode (determined by set-point current of 1 nA). Theoretical plots are based on a tight-binding model with t1 = 0.14 eV, t2 = t3 = 0.04 eV. Scale bars, 2 nm.
