Spin excitations in nanographene-based antiferromagnetic spin-½ Heisenberg chains

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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Zhao, Chenxiao</dc:creator>
  <dc:creator>Yang, Lin</dc:creator>
  <dc:creator>Henriques, João</dc:creator>
  <dc:creator>Ferri-Cortés, Mar</dc:creator>
  <dc:creator>Catarina, Gonçalo</dc:creator>
  <dc:creator>Pignedoli, Carlo A.</dc:creator>
  <dc:creator>Ma, Ji</dc:creator>
  <dc:creator>Feng, Xinliang</dc:creator>
  <dc:creator>Ruffieux, Pascal</dc:creator>
  <dc:creator>Rossier, Joaquín</dc:creator>
  <dc:creator>Fasel, Roman</dc:creator>
  <dc:date>2025-01-22</dc:date>
  <dc:description>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.</dc:description>
  <dc:identifier>https://materialscloud-archive-failover.cineca.it/record/2025.16</dc:identifier>
  <dc:identifier>doi:10.24435/materialscloud:zx-87</dc:identifier>
  <dc:identifier>mcid:2025.16</dc:identifier>
  <dc:identifier>oai:materialscloud.org:2348</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Materials Cloud</dc:publisher>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode</dc:rights>
  <dc:subject>spin liquid</dc:subject>
  <dc:subject>spin excitation</dc:subject>
  <dc:subject>fractional excitation</dc:subject>
  <dc:subject>spinon</dc:subject>
  <dc:subject>DFT</dc:subject>
  <dc:subject>MARVEL/P4</dc:subject>
  <dc:subject>CSCS</dc:subject>
  <dc:title>Spin excitations in nanographene-based antiferromagnetic spin-½  Heisenberg chains</dc:title>
  <dc:type>Dataset</dc:type>
</oai_dc:dc>