Light-driven electron transport through a molecular junction based on cross-conjugated systems

Abstract

This work explores light-driven electron transport through cross-conjugated molecules with different numbers of alkenyl groups. In the framework of coherent quantum transport, the analysis uses single-particle Green’s functions together with non-Hermitian Floquet theory. With realistic parameters stemming from spectroscopy, the simulations show that measurable current (similar to 10(-11) A) caused by photon-assisted tunneling should be observed in a weak driving field (similar to 2 x 10(5) V/cm). Currentfield intensity characteristics give one-photon and two-photon field amplitude power laws. The gap between the molecular orbital and the Fermi level of the electrodes is revealed by current-field frequency characteristics. Due to generalized parity symmetry, the cross-conjugated molecules with odd and even numbers of alkenyl groups exhibit completely different current-polarization characteristics, which may provide an advantageous feature in nanoelectronic applications. (C) 2014 AIP Publishing LLC.