Observation of fractional edge excitations in nanographene spin chains
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{
"revision": 8,
"id": "929",
"created": "2021-07-09T07:53:43.907546+00:00",
"metadata": {
"doi": "10.24435/materialscloud:e8-aq",
"status": "published",
"title": "Observation of fractional edge excitations in nanographene spin chains",
"mcid": "2021.161",
"license_addendum": null,
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"keywords": [
"spin chains",
"nanographene",
"fractionalization",
"Graphene flagship",
"MARVEL/DD3",
"ERC",
"CSCS",
"H2020",
"SNSF"
],
"conceptrecid": "928",
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"references": [
{
"type": "Journal reference",
"doi": "10.1038/s41586-021-03842-3",
"comment": "Manuscript where the results are discussed",
"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)"
},
{
"type": "Preprint",
"url": "https://arxiv.org/abs/2105.09102",
"comment": "open access version of the manuscript",
"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)"
}
],
"publication_date": "Oct 11, 2021, 18:20:39",
"license": "Creative Commons Attribution 4.0 International",
"id": "929",
"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.",
"version": 1,
"contributors": [
{
"email": "SHM@zurich.ibm.com",
"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"
],
"familyname": "Mishra",
"givennames": "Shantanu"
},
{
"affiliations": [
"International Iberian Nanotechnology Laboratory, Braga, Portugal",
"University of Alicante, Sant Vicent del Raspeig, Spain"
],
"familyname": "Catarina",
"givennames": "Gon\u00e7alo"
},
{
"affiliations": [
"Technical University of Dresden, Dresden, Germany"
],
"familyname": "Wu",
"givennames": "Fupeng"
},
{
"affiliations": [
"University of Alicante, Sant Vicent del Raspeig, Spain"
],
"familyname": "Ortiz",
"givennames": "Ricardo"
},
{
"affiliations": [
"University of the Basque Country, San Sebasti\u00e1n, Spain",
"IKERBASQUE, Basque Foundation for Science, Bilbao, Spain"
],
"familyname": "Jacob",
"givennames": "David"
},
{
"email": "kristjan.eimre@empa.ch",
"affiliations": [
"Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland"
],
"familyname": "Eimre",
"givennames": "Kristjan"
},
{
"affiliations": [
"Technical University of Dresden, Dresden, Germany"
],
"familyname": "Ma",
"givennames": "Ji"
},
{
"affiliations": [
"Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland"
],
"familyname": "Pignedoli",
"givennames": "Carlo A."
},
{
"affiliations": [
"Technical University of Dresden, Dresden, Germany",
"Max Planck Institute of Microstructure Physics, Halle, Germany"
],
"familyname": "Feng",
"givennames": "Xinliang"
},
{
"email": "pascal.ruffieux@empa.ch",
"affiliations": [
"Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland"
],
"familyname": "Ruffieux",
"givennames": "Pascal"
},
{
"affiliations": [
"International Iberian Nanotechnology Laboratory, Braga, Portugal"
],
"familyname": "Fern\u00e1ndez-Rossier",
"givennames": "Joaqu\u00edn"
},
{
"affiliations": [
"Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland",
"University of Bern, Bern, Switzerland"
],
"familyname": "Fasel",
"givennames": "Roman"
}
],
"edited_by": 100
},
"updated": "2021-10-11T16:20:39.684552+00:00"
}