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HL: Fachverband Halbleiterphysik

HL 49: Molecular electronics (TT, jointly with CPP, HL, MA)

HL 49.7: Vortrag

Mittwoch, 13. März 2013, 11:15–11:30, H2

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

We present a microscopic STM theory, based on the reduced density matrix formalism, which is able to describe transport and topographical properties of interacting π-conjugated molecules on thin insulating films. Simulated current-voltage characteristics and constant height and constant current STM images for a Cu-Phthalocyanine (CuPc) molecule are presented as experimentally relevant examples. We predict negative differential conductance resulting from interference between degenerate many-body states of CuPc [1]. Criteria are given to find and identify the interference blocking scenario in experimental measurements.
[1] A. Donarini, B. Siegert, S. Sobczyk, and M. Grifoni, PRB 86, 155451 (2012).