Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Transport: Poster Session
TT 22.59: Poster
Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B
Optimal control of current and shot noise in molecular wires using femtosecond laser pulses — •Guangqi Li1, Michael Schreiber2, and Ulrich Kleinekathöfer1 — 1Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany — 2Institut für Physik, Technische Universität Chemnitz, 09107 Chemnitz, Germany
The tunneling of electrons through a molecular junction weakly coupled to two leads in the presence of a time-dependent external field is studied using using a master equation approach [1-4]. By combining the theory of optimal control and by using a predefined target current, a laser field can be obtained which does generate a predefined current pattern. The same technique can be applied to control also the shot noise in the system in order to minimize it. For a tight-binding approximation of the molecular wire we show how to compute the laser pulses to switch on and off the current through the wire . With this approach the current flow pattern in time can be chosen in an almost arbitrary fashion.
[1] S. Welack, M. Schreiber, and U. Kleinekathöfer, J. Chem.
Phys. 124, 044712 (2006).
[2] U. Kleinekathöfer, G.-Q. Li, S. Welack, and M. Schreiber,
Europhys. Lett. 75, 139 (2006).
[3] G.-Q. Li, M. Schreiber, and U. Kleinekathöfer
EPL 79, 27006/1-6 (2007).
[4] S. Kohler and P. Hänggi, Nature Nanotech. 2, 675 (2007)