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Optical atomic switches have garnered considerable interest due to its fast switching speed, low energy consumption, and compatibility with quantum information technologies. While atomic modulation via optical excitation has been demonstrated using scanning probe techniques, controlling atomic motion in operable devices remains a key challenge for practical applications. In this study, we operated an optical atomic switch and investigated molecular effects on conductance modulation. Single-molecule junctions incorporating C60, bipyridine, and butanediamine were fabricated using a mechanically controllable break junction technique. Photoirradiation induced conductance enhancement in all molecular junctions. Analysis of current–voltage characteristics in ON and OFF states revealed that atomic motion modulates the electronic coupling between the molecule and electrodes. A systematic comparison across different molecular junctions showed that molecular rigidity significantly influences optical conductance modulation, with flexible molecules like butanediamine exhibiting weaker dependence on initial conductance states.

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Keyword: Optical atomic switch, molecular junction

Date published: 2025-12-10

Publisher: Royal Society of Chemistry (RSC)

Journal:

• Journal of Materials Chemistry C (ISSN: 20507526) vol. 14 issue. 5 p. 1805-1810

Funding:

• Yazaki Memorial Foundation for Science and Technology
• Murata Science and Education Foundation
• Japan Society for the Promotion of Science 25K01740
• Japan Society for the Promotion of Science 21H01959

Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6179

First published URL: https://doi.org/10.1039/d5tc03002a

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Updated at: 2026-02-11 08:30:34 +0900

Published on MDR: 2026-02-10 18:03:02 +0900