Substitution Pattern Controlled Quantum Interference in [2.2]Paracyclophane-Based Single-Molecule Junctions

Poster (2021)

Authors

C. Hsu Kavli institute of nanoscience Delft, QN/van der Zant Lab - AS
Ksenia Reznikova University of Basel
Werner M. Schosser Universität Augsburg
Almudena Gallego University of Basel
Katawoura Beltako Universität Augsburg
Fabian Pauly Universität Augsburg
H.S.J. van der Zant Kavli institute of nanoscience Delft, QN/van der Zant Lab - AS
Marcel Mayor University of Basel
Research Group
QN/van der Zant Lab (AS) (TU Delft)
Copyright: © 2021 C. Hsu, Ksenia Reznikova, Werner M. Schosser, Almudena Gallego, Katawoura Beltako, Fabian Pauly, H.S.J. van der Zant, Marcel Mayor
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Published Date

2021

Language

English

Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/van der Zant Lab

Abstract

Quantum interference (QI) within a single-molecule junction has become an essential yet powerful concept to integrate for designing molecular electronic devices.1 Recently we have investigated the correlation between substitution pattern, conductance and mechanosensitivity in [2.2]paracyclophane(PCP)-based single-molecule junction via the mechanically controlled break junction technique (MCBJ).2,3 We study the influence on conductance when we introduce meta/para connection to the PCP core and the phenyl ring attached to the anchoring group. We find that (i) meta-phenyl-anchored PCP yields such low conductance levels that molecular features cannot be resolved; (ii) para-phenyl-coupled anchoring generally gives higher conductance levels which can be detected via MCBJ; (iii) pseudo-para-coupled PCP core manifests large mechanosensitivity while (iv) pseudo-meta-coupled PCP core show the absence of mechanosensitivity. These experimental findings are interpreted in terms of QI effects between molecular frontier orbitals by theoretical calculations based on density functional theory and the Landauer formalism.