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 11.3: Talk
Monday, March 12, 2018, 15:45–16:00, MA 004
Edge states in chiral-shaped graphene nanoribbons. — •Néstor Merino-Díez1,2, Jingcheng Li2,3, Aran García-lekue1,4, Sofía Sanz1, Thomas Frederiksen1, Diego Peña5, Dimas G. de Oteyza1,4, and Jose Ignacio Pascual2,4 — 1Donostia International Physics Center (DIPC) , 20018 San Sebastián (Spain) — 2CIC Nanogune, 20018 San Sebastián (Spain) — 3Centro de Física de Materiales (CFM), 20018 San Sebastián, (Spain) — 4Ikerbasque, 48013 Bilbao (Spain) — 5Centro de Investigación Química Biolóxica e Materiais Meloculares (CIQUS), 15782 Santiago de Compostela (Spain)
Understanding the configuration of electrons in graphene nanoribbons (GNRs), and the physical phenomena beneath, is still a challenging quest. Among all the GNRs studied to date, chiral-shaped GNRs (i.e. with periodically alternating armchair and zigzag-like segments) represent the most scarcely explored ones.
Recently we reported the growth of narrow chiral GNRs (alternating 3 zigzag-1 armchair segments) by depositing pre-designed molecular precursors on different coinage metallic surfaces [D.G. de Oteyza et al., ACSnano 10, 9000-9008 (2016)]. This ribbon presents a small semiconducting gap of 670mV [N. Merino-Díez et al., arXiv: 1710.05813]. Here we present the on-surface synthesis of wider chiral GNRs by using molecular precursors with additional anthracene units. Using scanning tunnelling spectroscopy we demonstrate that the width strongly determines the formation and shape of electronic edges states.