Publication date: Jan 22, 2025
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.
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ReadMe.yaml
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48.6 KiB | A read me file in the .yaml form detailing the contents of the record. |
data.tgz
MD5md5:b1252aaaefbcd6ef279f785087659dc3
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22.3 MiB | Archive file containing the files of the record. |
gw.aiida
MD5md5:abf6825b45e17295bc3ddbd33cda1b2d
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22.5 MiB | Archive file containing the aiida notes of the DFT calculations. |
2025.16 (version v1) [This version] | Jan 22, 2025 | DOI10.24435/materialscloud:zx-87 |