Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Transport: Molecular Electronics I (TT jointly with O)
O 40.4: Vortrag
Mittwoch, 2. April 2014, 10:15–10:30, HSZ 304
Laser pulse induced transient currents in a molecular junction — •Yaroslav Zelinskyy1,2 and Volkhard May1 — 1Institut 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)