2026-06-01T17:26:02Z https://archive.materialscloud.org/oai2d

oai:materialscloud.org:2348 2025-01-22T15:23:25Z openaire_data community-mcarchive

Zhao, Chenxiao Feng, Xinliang Ruffieux, Pascal Rossier, Joaquín Fasel, Roman Zhao, Chenxiao Yang, Lin Henriques, João Ferri-Cortés, Mar Catarina, Gonçalo Pignedoli, Carlo A. Ma, Ji Feng, Xinliang Ruffieux, Pascal Rossier, Joaquín Fasel, Roman 2025-01-22 Antiferromagnetic Heisenberg chains exhibit two distinct types of excitation spectra: gapped for integer-spin chains and gapless for half-integer-spin chains. However, in finite-length half-integer-spin chains, quantization induces a gap, requiring precise control over sufficiently long chains to study its evolution. In a recent publication, we created length-controlled spin-1/2 Heisenberg chains by covalently linking olympicenes—Olympic ring-shaped magnetic nanographenes. With large exchange interactions, tunable lengths, and negligible magnetic anisotropy, this system is ideal for investigating length-dependent spin excitations, probed via inelastic electron tunneling spectroscopy. We observe a power-law decay of the lowest excitation energy with length L, following a 1/L dependence in the large-L regime, consistent with theory. For L=50, a V-shaped excitation continuum confirms gapless behavior in the thermodynamic limit. Additionally, low-bias current maps reveal the standing wave of a single spinon in odd-numbered chains. Our findings provide evidence for the realization of a one-dimensional analog of a gapless spin liquid within an artificial graphene lattice. This record includes all the data that support the results discussed in the publication. application/octet-stream application/gzip application/octet-stream text/markdown https://doi.org/10.24435/materialscloud:zx-87 oai:materialscloud.org:2348 mcid:2025.16 eng Materials Cloud https://renkulab.io/projects/new?data=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 https://archive.materialscloud.org/communities/mcarchive https://doi.org/10.24435/materialscloud:9z-1f info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode spin liquid spin excitation fractional excitation spinon DFT MARVEL/P4 CSCS Spin excitations in nanographene-based antiferromagnetic spin-½ Heisenberg chains info:eu-repo/semantics/other