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Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 40: Transport: Molecular Electronics I (TT jointly with O)

O 40.4: Talk

Wednesday, April 2, 2014, 10:15–10:30, HSZ 304

Laser pulse induced transient currents in a molecular junction — •Yaroslav Zelinskyy1,2 and Volkhard May11Institut für Physik, Humboldt Universität zu Berlin — 2Bogolubov Institute for Theoretical Physics, National Academy of Science of Ukraine

The investigation of transient phenomena in molecular junctions is of increasing interest. As an example, computations are presented on femtosecond laser pulse excitations and subsequent transient current formation. A single molecule sandwiched between two spherical leads is considered[1,2]. Optical excitation of the leads is accounted for by their collective plasmon excitations which may also couple to the molecular excitations. While this coupling may be strong the electron transfer coupling of the molecule to the leads is considered to be small to stay in the regime of sequential charge transmission. All the calculations of transient currents are performed in the framework of a density matrix theory. As a quantity detectable in the experiment the averaged dc–current resulting from a huge sequence of laser pulses is also calculated . The obtained transient currents are confronted with those induced by voltage pulses[3].
L. Wang and V. May, Phys.Chem.Chem.Phys. 13, 8755 (2011)
Y. Zelinskyy and V. May, Nano Lett. 12, 446 (2012)
Y. Zelinskyy and V. May, J. Chem. Phys. (submitted)

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