Observation of fractional edge excitations in nanographene spin chains


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{
  "created": "2021-07-09T07:53:43.907546+00:00", 
  "metadata": {
    "mcid": "2021.161", 
    "references": [
      {
        "type": "Journal reference", 
        "doi": "10.1038/s41586-021-03842-3", 
        "citation": "S. Mishra, G. Catarina, F. Wu, R. Ortiz, D. Jacob, K. Eimre, J. Ma, C. A. Pignedoli, X. Feng, P. Ruffieux, J. Fern\u00e1ndez-Rossier, R. Fasel, Nature (2021)", 
        "comment": "Manuscript where the results are discussed"
      }, 
      {
        "type": "Preprint", 
        "citation": "S. Mishra, G. Catarina, F. Wu, R. Ortiz, D. Jacob, K. Eimre, J. Ma, C. A. Pignedoli, X. Feng, P. Ruffieux, J. Fern\u00e1ndez-Rossier, R. fasel, arXiv:2105.09102 [cond-mat.mes-hall] (2021)", 
        "comment": "open access version of the manuscript", 
        "url": "https://arxiv.org/abs/2105.09102"
      }
    ], 
    "doi": "10.24435/materialscloud:e8-aq", 
    "contributors": [
      {
        "email": "SHM@zurich.ibm.com", 
        "givennames": "Shantanu", 
        "familyname": "Mishra", 
        "affiliations": [
          "Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland", 
          "Present address: IBM Research \u2013 Zurich, R\u00fcschlikon, Switzerland"
        ]
      }, 
      {
        "givennames": "Gon\u00e7alo", 
        "familyname": "Catarina", 
        "affiliations": [
          "International Iberian Nanotechnology Laboratory, Braga, Portugal", 
          "University of Alicante, Sant Vicent del Raspeig, Spain"
        ]
      }, 
      {
        "givennames": "Fupeng", 
        "familyname": "Wu", 
        "affiliations": [
          "Technical University of Dresden, Dresden, Germany"
        ]
      }, 
      {
        "givennames": "Ricardo", 
        "familyname": "Ortiz", 
        "affiliations": [
          "University of Alicante, Sant Vicent del Raspeig, Spain"
        ]
      }, 
      {
        "givennames": "David", 
        "familyname": "Jacob", 
        "affiliations": [
          "University of the Basque Country, San Sebasti\u00e1n, Spain", 
          "IKERBASQUE, Basque Foundation for Science, Bilbao, Spain"
        ]
      }, 
      {
        "email": "kristjan.eimre@empa.ch", 
        "givennames": "Kristjan", 
        "familyname": "Eimre", 
        "affiliations": [
          "Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland"
        ]
      }, 
      {
        "givennames": "Ji", 
        "familyname": "Ma", 
        "affiliations": [
          "Technical University of Dresden, Dresden, Germany"
        ]
      }, 
      {
        "givennames": "Carlo A.", 
        "familyname": "Pignedoli", 
        "affiliations": [
          "Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland"
        ]
      }, 
      {
        "givennames": "Xinliang", 
        "familyname": "Feng", 
        "affiliations": [
          "Technical University of Dresden, Dresden, Germany", 
          "Max Planck Institute of Microstructure Physics, Halle, Germany"
        ]
      }, 
      {
        "email": "pascal.ruffieux@empa.ch", 
        "givennames": "Pascal", 
        "familyname": "Ruffieux", 
        "affiliations": [
          "Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland"
        ]
      }, 
      {
        "givennames": "Joaqu\u00edn", 
        "familyname": "Fern\u00e1ndez-Rossier", 
        "affiliations": [
          "International Iberian Nanotechnology Laboratory, Braga, Portugal"
        ]
      }, 
      {
        "givennames": "Roman", 
        "familyname": "Fasel", 
        "affiliations": [
          "Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland", 
          "University of Bern, Bern, Switzerland"
        ]
      }
    ], 
    "license": "Creative Commons Attribution 4.0 International", 
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    "is_last": true, 
    "title": "Observation of fractional edge excitations in nanographene spin chains", 
    "id": "929", 
    "owner": 26, 
    "description": "Fractionalization is a phenomenon in which strong interactions in a quantum system drive the emergence of excitations with quantum numbers that are absent in the building blocks. Outstanding examples are excitations with charge e/3 in the fractional quantum Hall effect, solitons in one-dimensional conducting polymers and Majorana states in topological superconductors. Fractionalization is also predicted to manifest itself in low-dimensional quantum magnets, such as one-dimensional antiferromagnetic S = 1 chains. The fundamental features of this system are gapped excitations in the bulk and, remarkably, S = 1/2 edge states at the chain termini, leading to a four-fold degenerate ground state that reflects the underlying symmetry-protected topological order. This record contains data to support the result in a recent publication of ours where we use on-surface synthesis to fabricate one-dimensional spin chains that contain the S = 1 polycyclic aromatic hydrocarbon triangulene as the building block. Using scanning tunneling microscopy and spectroscopy at 4.5 K, we probe length-dependent magnetic excitations at the atomic scale in both open-ended and cyclic spin chains, and directly observe gapped spin excitations and fractional edge states therein. Exact diagonalization calculations provide conclusive evidence that the spin chains are described by the S = 1 bilinear-biquadratic Hamiltonian in the Haldane symmetry-protected topological phase. Our results open a bottom-up approach to study strongly correlated phases in purely organic materials, with the potential for the realization of measurement-based quantum computation.", 
    "status": "published", 
    "edited_by": 100, 
    "conceptrecid": "928", 
    "publication_date": "Oct 11, 2021, 18:20:39", 
    "_oai": {
      "id": "oai:materialscloud.org:929"
    }, 
    "license_addendum": null, 
    "version": 1, 
    "keywords": [
      "spin chains", 
      "nanographene", 
      "fractionalization", 
      "Graphene flagship", 
      "MARVEL/DD3", 
      "ERC", 
      "CSCS", 
      "H2020", 
      "SNSF"
    ]
  }, 
  "id": "929", 
  "updated": "2021-10-11T16:20:39.684552+00:00", 
  "revision": 8
}