Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Graphene I: Structure and Growth (joint session O/TT)
O 7.6: Vortrag
Montag, 1. April 2019, 12:00–12:15, H24
Aperiodically ordered nano-graphene — •Mahalingam Maniraj1, Lu Lyu1, Sebastian Becker1,2, Dominik Jungkenn1, Sebastian Emmerich1, Sina Mousavion1, D L Schlagel3, T A Lograsso3, Sudipta Roy Barman4, Stefan Mathias5, Benjamin Stadtmuller1, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Germany — 2Department of Chemistry, TU Kaiserslautern, Germany — 3Division of Materials Sciences and Engineering, Ames Laboratory, USA — 4UGC-DAE Consortium for Scientific Research, Indore (M.P.), India — 5I. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany
We demonstrate that the quasiperiodic order of surfaces can be transferred to 2D adsorbate systems by investigating the self-assembly of the nano graphene molecule coronene on the icosahedral(i)-Al-Pd-Mn quasicrystalline surfaces using multiple surface sensitive techniques. We find a quasiperiodic ordering of coronene on the i-Al-Pd-Mn surface which can be explained qualitatively by the P1 Penrose tilling. Using angle resolved photoemission spectroscopy, we observe a 5-fold symmetric modulation of the photoemission intensity distribution in the kx-ky-plane with a clear band dispersion along the high symmetry axis in momentum space. The latter suggests a direct correlation between the energy and momenta of the electrons in the quasicrystal and the rotational symmetry of the system. Moreover, the pseudogap of the bare Al-Pd-Mn persists even after the adsorption of the aperiodically ordered coronene confirming the quasiperiodic nature of the interface.