Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Molecular Electronics and Photonics
TT 24.2: Vortrag
Dienstag, 2. April 2019, 09:45–10:00, H22
Large Conductance Variations in a Mechanosensitive Single-Molecule Junction — •Maxim Skripnik1,2, Davide Stefani3, Kevin J. Weiland4, Chunwei Hsu3, Mickael L. Perrin3,5, Marcel Mayor4,6,7, Herre S. J. van der Zant3, and Fabian Pauly1,2 — 1Okinawa Institute of Science and Technology, Japan — 2University of Konstanz, Germany — 3Delft University of Technology, The Netherlands — 4University of Basel, Switzerland — 5Swiss Federal Laboratories for Materials Science and Technology, Switzerland — 6Karlsruhe Institute of Technology, Germany — 7Sun Yat-Sen University, China
Using quantum-chemistry calculations we show that the conductance of a spring-like molecule can be mechanically controlled by several orders of magnitude by compressing or elongating it. [1] The calculations indicate that the large conductance variations are the result of a destructive quantum interference between the frontier orbitals. Furthermore, oscillations in the conductance occur when the stress built up in the molecule is high enough to allow the anchoring groups to move along the surface in a stick-slip-like fashion. Theoretical results are very well supported by break-junction measurements which demonstrate that the large conductance variations are also present at room temperature. This may open the door for applications in, e.g., a nanoscale mechanosensitive sensing device that does not rely on cryogenic cooling.
D. Stefani et al., Nano Lett. 18, 5981 (2018).