Figure 3
From: Controlling single-molecule junction conductance by molecular interactions
The effect of intermolecular coupling to the molecular conductance.
(a) STM image of a phenoxy dimer arranged along [001] with a separation of two atomic distance (2b0). (b) The left molecule is moved in the [
10] direction by one atomic distance (a0 = 2.56 Å). (c) The molecule is further displaced. The molecular configurations are represented by (m,n), indicating the position of neighboring molecule relative to the probed molecule. The image sizes are 28 × 32 Å2. (d) Typical current plateau for the probed molecule in the (2,2), (2,1) and (2,0) configurations, together with that for the isolated monomer. The curves were obtained with the same tip apex. (e) The conductance data for the (2,2), (2,1), (2,0), (−2,−2), (−2,−1) and (−2,0) configurations are shown by circles. The calculated data for the first three are shown by squares. The data are represented by the ratio to that for an isolated molecule and the error bars are the standard deviation of the collected data for different tips and molecules. The calculated data shown are the average values for h = 13.9 Å and h = 14.4 Å (x = 1.4 Å, Supplementary Fig. 5). (f) The position dependence of the molecular conductance displayed by the color scale. The probed molecule is located at the origin with another (perturbing) molecule located at (mb0,na0). The conductance is reduced for the configurations of (2,0), (2,±1) and (1,±1) within the experimental uncertainty and converges to that of a monomer as the molecule is brought apart.
