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Magnetic exchange interactions between localized spins in π-electron magnetism of carbon-based nanostructures have attracted tremendous interest due to their great potential for nano spintronics. Unique many-body quantum characteristics, such as gaped excitations, strong spin entanglement, and fractionalized excitations, have been demonstrated, but the spin-1/2 Heisenberg model with a single antiferromagnetic coupling J value remained unexplored. Here, we realized the entangled antiferromagnetic quantum spin-1/2 Heisenberg model with diazahexabenzocoronene oligomers (up to 7 units) on Au(111). Extensive low-temperature scanning tunneling microscopy/spectroscopy measurements and density functional theory and many-body calculations show that even-numbered spin chains host a collective state with gapped excitations, while odd-numbered chains feature a Kondo excitation. We found that a given antiferromagnetic coupling J value between first neighbors in the entangled quantum states is responsible for the quantum p

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• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

Keyword: scanning tunneling microscopy/spectroscopy, spin-1/2 Heisenberg model, diazahexabenzocoronene oligomers, topological spin lattices, entangled quantum states

Date published: 2025-02-28

Publisher: American Association for the Advancement of Science (AAAS)

Journal:

• SCIENCE ADVANCES (ISSN: 23752548) vol. 11 issue. 9

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Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1126/sciadv.ads1641

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Updated at: 2025-03-06 12:30:14 +0900

Published on MDR: 2025-03-06 12:30:15 +0900