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O: Fachverband Oberflächenphysik
O 11: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures I
O 11.5: Talk
Monday, March 12, 2018, 16:15–16:30, MA 004
Electronic band structure of poly (meta-phenylene) zigzag chains — •Ignacio Piquero-Zulaica1, Aran García-Lekue2,3, Claudio K. Krug4, J. Enrique Ortega1,2,5, J. Michael Gottfried4, and Jorge Lobo-Checa6,7 — 1Centro de Física de Materiales CSIC/UPV-EHU, San Sebastian, Spain — 2Donostia International Physics Center, San Sebastian, Spain — 3Ikerbasque, Basque Foundation for Science, Bilbao, Spain — 4Fachbereich Chemie, Philipps-Universität Marburg, Germany — 5Universidad del País Vasco, Dpto. Física Aplicada I, San Sebastian, Spain — 6Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, Spain — 7Departamento de Física de la Materia Condensada, Universidad de Zaragoza, Spain
Carbon based low-dimensional nanostructures such as on-surface synthesized Graphene nanoribbons (GNRs) and oligophenylene chains provide a vast playground for developing organic semiconductors with specific electronic properties. For instance, recent ARPES band structure studies on macroscopically aligned poly (para-phenylene) (PPP) and armchair-GNRs unraveled highly dispersive electronic bands with a large HOMO-LUMO gap. Analogously, we generate atomically precise and aligned on-surface synthesized poly (meta-phenylene) (PMP) zigzag chains on a curved Ag(111) surface. With the use of ARPES, we unravel its band structure for the first time and find weakly dispersive bands with considerably increased HOMO-LUMO gap. These results, supported with DFT calculations, suggest a strong tunability of the polymer's electronic properties that we can correlate to its topology.