Massive Dirac fermion behavior in a low bandgap graphene nanoribbon near a topological phase boundary


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{
  "revision": 6, 
  "created": "2020-07-07T09:01:06.090840+00:00", 
  "metadata": {
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    "references": [
      {
        "type": "Journal reference", 
        "citation": "Q. Sun, O. Gr\u00f6ning, J. Overbeck, O. Braun, M. L. Perrin, G. Borin Barin, M. El Abbassi, K. Eimre, E. Ditler, C. Daniels, V. Meunier. C. A. Pignedoli, M. Calame, R. Fasel, P. Ruffieux,\nAdv. Mater. 32, 1906054 (2020)", 
        "doi": "10.1002/adma.201906054"
      }
    ], 
    "id": "456", 
    "contributors": [
      {
        "familyname": "Sun", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Qiang"
      }, 
      {
        "email": "oliver.groening@empa.ch", 
        "familyname": "Gr\u00f6ning", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Oliver"
      }, 
      {
        "familyname": "Overbeck", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland", 
          "Department of Physics, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland"
        ], 
        "givennames": "Jan"
      }, 
      {
        "familyname": "Braun", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland", 
          "Department of Physics, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland"
        ], 
        "givennames": "Oliver"
      }, 
      {
        "familyname": "Perrin", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Mickael L."
      }, 
      {
        "familyname": "Borin Barin", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Gabriela"
      }, 
      {
        "familyname": "El Abbassi", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Maria"
      }, 
      {
        "familyname": "Eimre", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Kristjan"
      }, 
      {
        "familyname": "Ditler", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Edward"
      }, 
      {
        "familyname": "Daniels", 
        "affiliations": [
          "Rensselaer Polytechnic Institute, Department of Physics, Applied Physics and Astronomy, Troy, NY, 12180 USA"
        ], 
        "givennames": "Colin"
      }, 
      {
        "familyname": "Meunier", 
        "affiliations": [
          "Rensselaer Polytechnic Institute, Department of Physics, Applied Physics and Astronomy, Troy, NY, 12180 USA"
        ], 
        "givennames": "Vincent"
      }, 
      {
        "email": "carlo.pignedoli@empa.ch", 
        "familyname": "Pignedoli", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Carlo A."
      }, 
      {
        "familyname": "Calame", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland", 
          "Department of Physics, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland"
        ], 
        "givennames": "Michel"
      }, 
      {
        "familyname": "Fasel", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland", 
          "Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland"
        ], 
        "givennames": "Roman"
      }, 
      {
        "email": "pascal.ruffieux@empa.ch", 
        "familyname": "Ruffieux", 
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "givennames": "Pascal"
      }
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    "status": "published", 
    "license": "Creative Commons Attribution 4.0 International", 
    "version": 1, 
    "title": "Massive Dirac fermion behavior in a low bandgap graphene nanoribbon near a topological phase boundary", 
    "doi": "10.24435/materialscloud:gb-wz", 
    "description": "Graphene nanoribbons (GNRs) have attracted much interest due to their largely modifiable electronic properties. Manifestation of these properties requires atomically precise GNRs which can be achieved through a bottom\u2013up synthesis approach. This has recently been applied to the synthesis of width\u2010modulated GNRs hosting topological electronic quantum phases, with valence electronic properties that are well captured by the Su\u2013Schrieffer\u2013Heeger (SSH) model describing a 1D chain of interacting dimers. In this record we provide data to support our recent publication where we demonstrate that ultralow bandgap GNRs with charge carriers behaving as massive Dirac fermions can be realized when their valence electrons represent an SSH chain close to the topological phase boundary, i.e., when the intra\u2010 and interdimer coupling become approximately equal. Such a system has been achieved via on\u2010surface synthesis based on readily available pyrene\u2010based precursors and the resulting GNRs are characterized by scanning probe methods. The pyrene\u2010based GNRs (pGNRs) can be processed under ambient conditions and incorporated as the active material in a field effect transistor. A quasi\u2010metallic transport behavior is observed at room temperature, whereas at low temperature, the pGNRs behave as quantum dots showing single\u2010electron tunneling and Coulomb blockade. This study may enable the realization of devices based on carbon nanomaterials with exotic quantum properties.", 
    "_oai": {
      "id": "oai:materialscloud.org:456"
    }, 
    "mcid": "2020.78", 
    "conceptrecid": "455", 
    "keywords": [
      "MARVEL/DD3", 
      "SNSF", 
      "ab initio", 
      "graphene nanoribbons", 
      "dirac fermions"
    ], 
    "publication_date": "Jul 15, 2020, 18:18:28"
  }, 
  "updated": "2020-07-15T16:18:28.924007+00:00", 
  "id": "456"
}