Fig. 1 | Nature Communications

Fig. 1

From: Symmetry breakdown of 4,4″-diamino-p-terphenyl on a Cu(111) surface by lattice mismatch

Fig. 1

Different adsorption geometries of DATP on Cu(111). a AFM frequency shift image showing two terraces (upper terrace in right and lower in left part) separated by monoatomic step. The tunneling current was used for tip-sample feedback. Imaging parameters: gap voltage = 10 mV, tunneling set point = 100 pA. Type I and II adsorption structures are indicated by red and orange arrows. Red arrows are pointing towards the fuzzy side of the type I structures. Symmetry reduction from six-fold to three-fold is observed, i.e., orientations that correspond to the three dashed white arrows are not observed on neither terrace. b Chemical structure of DATP. c, d Constant height AFM zoom-in images of type I and type II adsorption structures. e Transition from type II to type I during constant height upward scan. Parameters: the tip-heights Δz are c + 20 pm, d −85 pm, e −85 pm, relative to a STM set point of 100 mV, 10 pA on bare Cu surfaces. The +/− signs represent increase/decrease of the tip-sample distance. Scale bars: a 10 nm, ce 0.5 nm

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