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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Molecular Electronics and Photonics (joint session TT/CPP)

CPP 25.2: Vortrag

Dienstag, 28. März 2023, 12:15–12:30, HSZ 201

Mechanosensitive single-molecule junctions — •Fabian Pauly — University of Augsburg, Augsburg, Germany

Quantum interference of electron waves passing through a single-molecule junction provides a powerful way to influence its electrical properties. By distorting a molecule, showing a destructive quantum interference, small changes of electrode distance can lead to huge changes of electrical conductance. This mechanosensitivity is a desirable feature for highly sensitive stress sensors. Here, I will discuss recent combined experimental and theoretical studies of mechanosensitive molecular wires based on paracyclophanes and porphyrins [1-4]. Experimental findings are interpreted in terms of quantum interference effects between molecular frontier orbitals by theoretical calculations based on density functional theory and the Landauer scattering formalism.
[1] D. Stefani et al., Nano Lett. 18, 5981 (2018)
[2] K. Reznikova et al., J. Am. Chem. Soc. 143, 13944 (2021)
[3] W. M. Schosser et al., Nanoscale 14, 984 (2022)
[4] C. Hsu et al., Chem. Sci. 13, 8017 (2022)