Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 63: Posters: Scanning Probe Methods

O 63.17: Poster

Mittwoch, 2. April 2014, 17:30–21:00, P2

Single molecule heat transport — •Nils Könne, Konstantin Kloppstech, Ludwig Worbes, David Hellmann, and Achim Kittel — EHF, Fak. V, Physik, Carl von Ossietzky Universität Oldenburg

The heat transport and dissipation in molecular junctions is a topic of high interest [1] and scientific value. To overcome the experimental challenges of contacting a single molecule and detecting the heat transport we are using our self-developed near field scanning thermal microscope (NSThM) which consists of a STM with a nanoscale build in thermocouple in the tip. This allows us, to measure simultaneously the electrical I(t) and heat Q(t) current as a function of time and temperature under ultra high vacuum conditions. Analogous to the determination of the electrical transport through a molecule we are using the so called I(t)-Method, introduced by W. Haiss et al [2] which reveals the spontaneous formation of metal - molecule - metal junctions leading to an on-and-off switching process of a single molecule. This will be used to identify the heat transport through a single molecule. First results are presented for octanedithiol as a typical linear switching molecule. [1] Woochul Lee et al, Nature 498, 209 (2013). [2] Wolfgang Haiss et al, Phys. Chem. Chem. Phys. 6, 4330-4337 (2004)