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

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{
  "metadata": {
    "edited_by": 576, 
    "references": [
      {
        "type": "Preprint", 
        "citation": "arXiv:2408.10045", 
        "doi": "arXiv:2408.10045"
      }
    ], 
    "license_addendum": null, 
    "status": "published", 
    "is_last": true, 
    "contributors": [
      {
        "email": "chenxiao.zhao@emap.ch", 
        "givennames": "Chenxiao", 
        "familyname": "Zhao", 
        "affiliations": [
          "Swiss Federal Laboratories for Materials Science and Technology, D\u00fcbendorf, Switzerland"
        ]
      }, 
      {
        "affiliations": [
          "Max Planck Institute of Microstructure Physics, Halle, Germany"
        ], 
        "givennames": "Lin", 
        "familyname": "Yang"
      }, 
      {
        "affiliations": [
          "International Iberian Nanotechnology Laboratory, Braga, Portugal."
        ], 
        "givennames": "Jo\u00e3o", 
        "familyname": "Henriques"
      }, 
      {
        "affiliations": [
          "Departamento de F\u00edsica Aplicada, Universidad de Alicante, San Vicente del Raspeig, Alicante, Spain"
        ], 
        "givennames": "Mar", 
        "familyname": "Ferri-Cort\u00e9s"
      }, 
      {
        "affiliations": [
          "Swiss Federal Laboratories for Materials Science and Technology, D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Gon\u00e7alo", 
        "familyname": "Catarina"
      }, 
      {
        "affiliations": [
          "Swiss Federal Laboratories for Materials Science and Technology, D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Carlo A.", 
        "familyname": "Pignedoli"
      }, 
      {
        "affiliations": [
          "Max Planck Institute of Microstructure Physics, Halle, Germany"
        ], 
        "givennames": "Ji", 
        "familyname": "Ma"
      }, 
      {
        "email": "xinliang.feng@tu-dresden.de", 
        "givennames": "Xinliang", 
        "familyname": "Feng", 
        "affiliations": [
          "Faculty of Chemistry and Food Chemistry, and Center for Advancing Electronics Dresden, Technical University of Dresden, Dresden, Germany", 
          "Max Planck Institute of Microstructure Physics, Halle, Germany"
        ]
      }, 
      {
        "email": "pascal.ruffieux@empa.ch", 
        "givennames": "Pascal", 
        "familyname": "Ruffieux", 
        "affiliations": [
          "Swiss Federal Laboratories for Materials Science and Technology, D\u00fcbendorf, Switzerland"
        ]
      }, 
      {
        "email": "oaquin.fernandez-rossier@inl.int", 
        "givennames": "Joaqu\u00edn", 
        "familyname": "Rossier", 
        "affiliations": [
          "International Iberian Nanotechnology Laboratory, Braga, Portugal."
        ]
      }, 
      {
        "email": "roman.fasel@empa.ch", 
        "givennames": "Roman", 
        "familyname": "Fasel", 
        "affiliations": [
          "Swiss Federal Laboratories for Materials Science and Technology, D\u00fcbendorf, Switzerland", 
          "University of Bern, Bern, Switzerland"
        ]
      }
    ], 
    "doi": "10.24435/materialscloud:zx-87", 
    "conceptrecid": "2347", 
    "owner": 1118, 
    "_oai": {
      "id": "oai:materialscloud.org:2348"
    }, 
    "version": 1, 
    "keywords": [
      "spin liquid", 
      "spin excitation", 
      "fractional excitation", 
      "spinon", 
      "DFT", 
      "MARVEL/P4", 
      "CSCS"
    ], 
    "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\u2014Olympic 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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    ], 
    "publication_date": "Jan 22, 2025, 15:23:25", 
    "license": "Creative Commons Attribution 4.0 International", 
    "title": "Spin excitations in nanographene-based antiferromagnetic spin-\u00bd  Heisenberg chains", 
    "mcid": "2025.16", 
    "id": "2348"
  }, 
  "revision": 4, 
  "created": "2024-09-20T16:04:33.902528+00:00", 
  "id": "2348", 
  "updated": "2025-01-22T14:23:25.318189+00:00"
}