Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 75: Poster Session: Transport 1

TT 75.19: Poster

Donnerstag, 23. März 2017, 15:00–19:00, P2-EG

Vibrational excitations in current-driven single-molecule junctions — •Joachim Reichert¹, Hai Bi¹, Carlos-Andres Palma¹, Yuxiang Gong¹, Mark Elbing², Marcel Mayor^2,3, and Johannes V. Barth¹ — ¹Physik-Department, Technische Universität München, Germany — ²Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany — ³Department of Chemistry, University of Basel, Switzerland

In order to advance the development of unimolecular electronic devices, it is mandatory to improve understanding of electron transport and its loss mechanisms in single molecules. One fundamental challenge in molecular electronics is the quantitative determination of charge-vibrational coupling for well-defined single-molecule junctions.

Here we determine the charge-vibrational coupling for a current-carrying, chemically defined metal-molecule-metal junction by synchronous vibrational and current-voltage spectroscopy. Measuring the steady-state vibrational distribution during charge transport in a bis-phenylethynyl-anthracene derivative by Raman scattering allows us to quantify the charge-vibrational coupling constant in this single-molecule system. Our work provides means to directly measure inelastic losses in (macro)molecular circuitry and introduces a general technique to perform optical spectroscopy on single-molecule junctions.