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Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 8: Transport: Quantum dots, wires, point contacts 1 (TT, jointly with HL, O)

HL 8.6: Talk

Monday, March 11, 2013, 10:45–11:00, H20

Iterative summation of path integrals for nonequilibrium molecular quantum transportRoland Huetzen1, •Stephan Weiss1,2, Michael Thorwart3, and Reinhold Egger11Heinrich-Heine Universität Düsseldorf, Universitätsstr.1, 40225 Düsseldorf — 2Universität Duisburg-Essen and CENIDE, 47048 Duisburg — 3Universität Hamburg, Jungiusstr. 9, 20355 Hamburg

We formulate and apply a nonperturbative numerical approach to the nonequilibrium current, I(V), through a voltage-biased molecular conductor. We focus on a single electronic level coupled to an unequilibrated vibration mode (Anderson-Holstein model), which can be mapped to an effective three-state problem. Performing an iterative summation of real-time path integral (ISPI) expressions, we accurately reproduce known analytical results in three different limits. We then study the crossover regime between those limits and show that the Franck-Condon blockade persists in the quantum-coherent low-temperature limit, with a nonequilibrium smearing of step features in the IV curve.
[1] S. Weiss, J. Eckel, M. Thorwart, and R. Egger, Phys. Rev. B 77, 195316 (2008).
R. Hützen, S. Weiss, M. Thorwart, and R. Egger, Phys. Rev. B 85, 121408 (2012).

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