Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 11: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures I

O 11.1: Invited Talk

Monday, March 12, 2018, 15:00–15:30, MA 004

Elementary phenomena in hybrid graphene nanoribbons on surfaces — •Nacho Pascual — CIC nanoGUNE, San Sebastian (Basque Country)

Graphene nanoribbons (GNR) are cornerstone materials for functional devices, but their properties strongly depend on atomic-scale details of their structure. On-surface synthesis strategies can produce them on a metal surface and control their shape with atomic precision by clever selection of organic precursors [1]. The physics of these carbon structures is full of elementary phenomenology that can be accessed with great detail combining high-resolution STM imaging with local spectroscopy. These ribbons behave as one-dimensional semiconductors with band structure that depends on their width [2] and growth direction [3], and can be tuned by doping them with chemical groups at their edge [4]. The functional character of the ribbons is enhanced when two or more precursors are mixed into hybrid ribbons, resulting in, for example, quantum electron boxes [5] embedded in the carbon backbone. To date, magnetism has been elusive in GNR structures. By incorporating magnetic species in the synthesis steps we created hybrid porphyrin-GNR molecular devices. We show that the molecular spin survives in the ribbon by using spin-excitation inelastic spectroscopy. [1] K. Cai et al., Nature 466, 470 (2010) [2] N. Merino et al., ACS nano 11, 11661 (2017) [3] D.G. de Oteyza et al., ACS Nano 10, 9000 (2016) [4] E.Carbonell et al., ACS Nano 11, 7355 (2017) [5] E. Carbonell et al., Nano Letters 17, 50 (2017)