Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.105: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Implementing a setup to detect ballistic and inelastic transport channels in an LT-STM experiment — •Maren C. Cottin, Johannes Schaffert, Rolf Möller, and Christian A. Bobisch — Faculty of Physics, Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47048 Duisburg, Germany

As low cost and easy to process alternatives to conventional inorganic semiconductors, organic molecules are already applied in a variety of electronic devices. For an improvement in speed, energy consumption and lifetime of these devices the understanding of the electronic transport through the molecules is essential. Electrons injected into a molecule by the tip of a scanning tunneling microscope (STM) may lead to an electronic excitation. The relaxation may follow different pathways, one of which is a radiative decay, i.e. the emission of photons [1]. The spectral analysis of these photons combined with the ultimate lateral resolution of the STM has been demonstrated to allow a mapping of dissipative channels within a single molecule [2]. Here, we present the implementation of a detection unit for light emission which is integrated into an existing home built low temperature STM experiment. As a complementary technique, ballistic electron emission microscopy (BEEM) can be used to identify ballistic transport channels [3]. The combination of both techniques will give further access to study transport phenomena on an atomic scale.

[1] R. Berndt et al., Science 262, 1425 (1993). [2] C. Chen et al., Phys. Rev,. Lett. 105, 217402 (2010). [3] A. Bannani et al., Science 315, 1824 (2007).