Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 74: Molecular Electronics and Photonics

TT 74.6: Vortrag

Mittwoch, 14. März 2018, 17:30–17:45, H 3005

Tension related vibrational frequency shifts in helicene molecules — •Yuxiang Gong¹, Chao Jing¹, Peter Hasch¹, Joachim Reichert¹, Ivo Starý², and Johannes Barth¹ — ¹Physik Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany — ²Institute of Organic Chemistry and Biochemistry ASCR, v.v.i. Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic

The investigation of electronic properties of organic molecules is a fundamental aspect in the field of molecular electronics. Molecular transistors, switches and amplifiers have been demonstrated. In this work, a single-molecule junction spectroscopy (MJS) technique is applied to detect the current-voltage characteristics and vibrational properties of 1,7-dithiol-7-helicene molecules simultaneously. The single-molecule junction can be established by approaching the substrate to a gold covered tetrahedral scanning near-field tip, which is monitored via Raman spectroscopy. Afterwards, the substrate is carefully retracted, stretching the molecule. At each step, a Raman spectrum is acquired. One distinct vibrational mode is analyzed, and reveals a systematic red shift corresponding to the applied strain in the single-molecule junction. The experimental results are complemented and explained by DFT simulations which take the electrodes into consideration.