Article Frustration-Induced Many-Body Degeneracy in Spin −1/2 Molecular Quantum Rings

Donglin Li ; Nan Cao ; Marvin Metzelaars ORCID ; Orlando J. Silveira ORCID ; Joakim Jestilä ORCID ; Adolfo Fumega ORCID ; Tomohiko Nishiuchi ORCID ; Jose Lado ORCID ; Adam S. Foster ORCID ; Takashi Kubo ORCID ; Shigeki Kawai SAMURAI ORCID

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Donglin Li, Nan Cao, Marvin Metzelaars, Orlando J. Silveira, Joakim Jestilä, Adolfo Fumega, Tomohiko Nishiuchi, Jose Lado, Adam S. Foster, Takashi Kubo, Shigeki Kawai. Frustration-Induced Many-Body Degeneracy in Spin −1/2 Molecular Quantum Rings. Journal of the American Chemical Society. 2025, 147 (30), 26208-26217. https://doi.org/10.1021/jacs.5c03112

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(abstract)

Frustrated spin systems, where competing interactions prevent conventional magnetic ordering, provide a platform for uncovering emergent quantum phases and exotic many-body phenomena. Particularly, low-dimensional and symmetric geometries without boundary conditions allow us to study the unconventional spin states. Here, we present S = 1/2 anti-ferromagnetic Heisenberg cyclic pentamer and hexamer via homocoupling of air-stable phenalenyl derivatives on Au(111). With a combination of scanning tunnelling microscopy/scanning tunnelling spectroscopy at 4.3 K and compre-hensive theoretical simulations, we found that while large magnetic exchange interactions exist in both rings, the pen-tamer features an increased geometric frustration of the system. This frustration induces rotational symmetry in the spin wavefunction, leading to a four-fold degenerate ground states of the pentamer. The interplay between molecular geometry and magnetic interactions creates the unique quantum spin environment. Our findings offer a powerful approach for constructing spin-frustrated molecular architectures, allowing precise control over quantum magnetic interactions.

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Keyword: scanning tunneling microscopy, quantum spin, spin-frustrated molecular, quantum magnetic interactions, scanning tunneling spectroscopy

Date published: 2025-07-30

Publisher: American Chemical Society (ACS)

Journal:

  • Journal of the American Chemical Society (ISSN: 00027863) vol. 147 issue. 30 p. 26208-26217

Funding:

  • Japan Society for the Promotion of Science 25H00422
  • Research Council of Finland 346824
  • Research Council of Finland 347319
  • Research Council of Finland 35808
  • Japan Society for the Promotion of Science 20H05865
  • Japan Society for the Promotion of Science 22H00285
  • Japan Society for the Promotion of Science 24H00459
  • Japan Society for the Promotion of Science 24K21721
  • Japan Society for the Promotion of Science 24KF0269
  • Research Council of Finland 331342

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

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First published URL: https://doi.org/10.1021/jacs.5c03112

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Updated at: 2025-08-20 08:30:20 +0900

Published on MDR: 2025-08-20 08:24:23 +0900

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