Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 104: Transport: Molecular electronics (TT with CPP/HL/MA/O)
HL 104.8: Talk
Friday, March 20, 2015, 11:30–11:45, H 0110
Photoinduced transient current through a molecular junction: Effects of lead excitation — •Yaroslav Zelinskyy1,2, Yoram Selzer3, and Volkhard May1 — 1Institut für Physik, Humboldt Universität zu Berlin, Newtonstraße 15, D-12489 Berlin, Germany — 2Bogolubov Institute for Theoretical Physics, National Academy of Science of Ukraine, 14-b Metrologichna str., UA-03683, Kiev, Ukraine — 3School of Chemistry, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
Laser pulse induced transient currents through a molecular junction are studied in the framework of a density matrix theory. By focusing on the sequential transport regime two types of lead excitation are considered. Firstly, effects of collective plasmon excitations of the leads and their resonant coupling to molecular excitations are investigated. If such a resonant coupling cannot be realized a second excitation regime would be of interest. Now, the nonequilibrium dynamics of individual lead electrons affect the transient current formation. While a resonant coupling to lead plasmon excitations induces a remarkable current enhancement nonequilibrium electron distributions in the leads determine the transient current mainly by their thermalization process. The theoretical framework described above is used to analyze time-resolved conductance measurements of molecular junctions based on Ferrocene molecules.
[1] L. Wang and V. May, Phys.Chem.Chem.Phys. 13, 8755 (2011).
[2] Y. Zelinskyy and V. May, Nano Lett. 12, 446 (2012).
[3] Y. Zelinskyy, Y. Selzer and V. May, Phys. Rev. B (submitted)).