Fig. 2: Conductance measurements of a single molecular chain with different electron energies.
From: Quantifying the conductivity of a single polyene chain by lifting with an STM tip
a The conductance as a function of tip height in the same molecular junction with different bias voltage. Black, light blue, blue, light red and red curves are conductance obtained under 10, 20, 50, 100 and 200 mV, respectively. The inset is a schematic illustration of the reversable conductance measurements through reciprocating movement. The conductance curves exhibit exponential decay as the tip height increases, accompanied by periodic oscillations. These oscillations can be attributed to the lifting up of a (CH)2 group within 2, occurring at a periodicity of 285\(\pm 36\) pm which is averaged over eleven independent measurements in Supplementary Table 2. The black dash line corresponds to the exponential fitting of conductance curve under 10 mV, with a decay constant (\(\beta\) value) of 0.086 \({\text{\AA}}^{-1}\). b The averaged decay constant (\(\beta\)) obtained from analyzing eleven independent reversable conductance measurements (fitting more than 60 conductance curves). Decay constants of ten different bias voltages all fall within the range of 0.10\(\pm\)0.02 \({\text{\AA}}^{-1}\), with lower \(\beta\) values in negative bias voltages compared with positive voltages. The dash gray line points at 0.1 \({\text{\AA}}^{-1}\). The original data are shown in Supplementary Fig. 9a and Supplementary Table 2. Source data are provided as a Source Data file.
