Figure 1

Measurement scheme. (a) Schematic structure of BDA molecule. (b) STM image of a Au(111) herringbone structure. Blue arrows indicate four deposited BDA molecules. (c) Schematic illustration of the 3D dynamic probe method. (d) Measurement scheme. Green, blue and orange lines indicate the z modulation and x- and y-scans, respectively and the red line shows the corresponding change in the normalized conductance G/G₀ (G₀ = 2e²/h, h is Planck’s constant). (e,f) G-z curves obtained without and with BDA molecule, respectively. G/G₀ indicates the normalized conductance (G₀ = 2e²/h, h is Planck’s constant).