Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Poster Session Transport
TT 38.24: Poster
Mittwoch, 16. März 2011, 14:00–18:00, P3
Optical Control of Single-Molecule Conductance — •Yaroslav Zelinskyy1,2 and Volkhard May2 — 1Bogolyubov Institute for theoretical physics, National Academy of Science of Ukraine, 14-b Metrologichna str. UA-03680, Kiev, Ukraine — 2Institut für Physik, Humboldt Universität zu Berlin, Newtonstraße 15, D-12489, Berlin, Germany
A kinetic model is established for current formation through a single molecule embedded in between two metallic electrodes and irradiated by an external laser pulse. Focusing on the particular case of a molecule which can be moved in its excited electronic state if it became singly charged, an analytical expression for the steady-state current is presented. A detailed analysis of the current-voltage as well as conductance-voltage characteristics at the different wavelength of the applied laser light is carried out. Based on such computations a photo-switching effect between molecular states of low and height conductivity can be proposed. In the case of weak molecule-lead coupling a voltage region showing negative differential resistance is found. Its suppression due to laser pulse excitation is indicated.