Molecular Quantum Rings Formed from a π -Conjugated Macrocycle

Judd, Chris J.; Nizovtsev, Anton S.; Plougmann, Rikke; Kondratuk, Dmitry V.; Anderson, Harry L.; Besley, Elena; Saywell, Alex

Abstract

The electronic structure of a molecular quantum ring (stacks of 40-unit cyclic porphyrin polymers) is characterized via scanning tunneling microscopy and scanning tunneling spectroscopy. Our measurements access the energetic and spatial distribution of the electronic states and, utilizing a combination of density functional theory and tight-binding calculations, we interpret the experimentally obtained electronic structure in terms of coherent quantum states confined around the circumference of the π-conjugated macrocycle. These findings demonstrate that large (53 nm circumference) cyclic porphyrin polymers have the potential to act as molecular quantum rings.

Citation

Judd, C. J., Nizovtsev, A. S., Plougmann, R., Kondratuk, D. V., Anderson, H. L., Besley, E., & Saywell, A. (2020). Molecular Quantum Rings Formed from a π -Conjugated Macrocycle. Physical Review Letters, 125(20), Article 206803. https://doi.org/10.1103/PhysRevLett.125.206803

• Journal Article Type: Article
• Acceptance Date: Sep 23, 2020
• Online Publication Date: Nov 13, 2020
• Publication Date: Nov 13, 2020
• Deposit Date: Sep 24, 2020
• Publicly Available Date: Nov 13, 2020
• Journal: Physical Review Letters
• Print ISSN: 0031-9007
• Electronic ISSN: 1079-7114
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 125
• Issue: 20
• Article Number: 206803
• DOI: https://doi.org/10.1103/PhysRevLett.125.206803
• Public URL: https://nottingham-repository.worktribe.com/output/4922726
• Publisher URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.206803