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Quantum well edge states in graphene nanoribbons

AuthorsFriedrich, Niklas; Li, Jingcheng; Merino-Díez, Nestor; Vilas-Varela, Manuel; Peña, Diego; Pascual, José I.
Issue Date2018
CitationInternational conference on Novel 2D materials explored via scanning probe microscopy and spectroscopy (2018)
AbstractGraphene nanoribbons (GNRs) can be synthesized on metal surfaces with atomic precision using on surface synthesis techniques. Their precise size and shape can be tuned finely by selecting appropriate precursor molecules. The incorporation of additional functional molecules during the on-surface synthesis allows the creation of hybrid systems. In earlier work, we demonstrated the creation of such hybrid systems by contacting magnetic porphyrin molecules with chiral (3,1)-GNRs on Au(111). However, in that work it was not analyzed in depth, to what extend the electronic bandstructure of the connecting GNRs is affected. Here, we present results from Fourier-transformed tunneling spectroscopy performed along the axis of a GNR segment enclosed by two porphyrins. We show that the presence of porphyrin creates a quantum well system, resulting in discrete resonant edge-states in the electronic bandstructure. We find a quadratic dispersion relation and extract from that an effective electron mass close to the one found in pristine ribbons.
DescriptionResumen del póster presentado a la International conference on: Novel 2D materials explored via scanning probe microscopy & spectroscopy; celebrada en Donostia.San Sebastián (País Vasco, España) del 25 al 29 de junio de 2018.
Appears in Collections:(CFM) Comunicaciones congresos
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