Electronic signature of single-molecular device based on polyacetylene derivative

We reported for polyacetylene chains containing N = 6, 10, 20 carbon atoms making bridges with gold electrodes which exhibit linear and nonlinear current/voltage signatures. The non-equilibrium quantum transport calculations are obtained from (1) low-voltage regime of 0-0.1 V and (2) high-voltage regime of 0-1.0 V. The nonlinear current/voltage behavior for high-voltage regime 0-1.0 V suggests that the system can operate as follows: (1) at 0.27 V there is a resonance captured by the I-V plot; (2) from 0.42 to 0.65 V a plateau is reached presenting a field effect transistor behavior; (3) there is a decrease in conductance from 0.66 V, and a negative differential resonance emerges with minimum value of 0.72 V. The linear I-V behavior will be reviewed, and we discuss the destructive quantum interference status. The effect occurs when we analyze the (1) low-voltage regime, and our results show that the conductance in oscillations maximizes the impact of quantum interferences (QI) on the I-V curve. In the present work, we demonstrate that QI in nanowire molecules is intimately related to the topology of the molecule's pi system and establish the existence of QI-induced transmission antiresonances when different voltage regimes are triggered.