Molecular Quantum Rings Formed from a π -Conjugated Macrocycle

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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Article number206803
Number of pages6
JournalPhysical Review Letters
Issue number20
Publication statusPublished - 13 Nov 2020




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