Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

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

O 40.2: Vortrag

Mittwoch, 2. April 2014, 09:45–10:00, HSZ 304

Multi-orbital STM theory for π-conjugated molecules on thin insulating films — •Benjamin Siegert, Andrea Donarini, and Milena Grifoni — Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg

We present a multi-orbital extension of our STM theory [1,2,3], based on the reduced density matrix formalism, which is capable of describing electronic transport through π-conjugated molecules on thin insulating films. In order to investigate spin-dependent transport effects using the example of a Cu-Phthalocyanine molecule, we set up an effective many-body Hamiltonian including exchange and spin-orbit interaction. The transport dynamics is calculated by evaluating a Generalized Master Equation including all diagonal and off-diagonal elements of the reduced density matrix of the molecule. Examples are shown of how many-body effects, like interference between degenerate many-body states, can affect the transport properties of π-conjugated molecules on thin insulating films in an STM setup.
S. Sobczyk, A. Donarini, and M. Grifoni, PRB 85, 205408 (2012).
A. Donarini, B. Siegert, S. Sobczyk, and M. Grifoni, PRB 86, 155451 (2012).
B. Siegert, A. Donarini and M. Grifoni, pss (b) 250, 2444 (2013)