Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 109: Tribology and Structure of Surfaces: Misc.
O 109.8: Talk
Friday, March 24, 2017, 12:30–12:45, WIL A317
Chemistry of artificial 2D orbitals — •Aizhan Sabitova1,2, Jeffrey Rawson2,3,4, Stefan Tautz1,2, and Ruslan Temirov1,2 — 1Peter Grünberg Institute (PGI-3), Forschungszentrum Jülich, Germany — 2JARA - Fundamentals of Future Information Technology — 3Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich, Germany — 4Institute of Inorganic Chemistry, RWTH Aachen, Germany
Two-dimensional (2D) electron systems represent a fascinating area of research. Several bottom-top approaches to engineering of such systems with defined energy spectra have been presented recently [1-4]. In our work we pattern a commensurate monolayer of 3,4,9,10-perylenetetracarboxylic-dianhydride (PTCDA) on Ag(111) using a low-temperature scanning tunneling microscope to produce vacancies and study their electronic structure. Produced vacancies possess electronic orbitals that appear as a bound state below the onset of dispersive 2D interface state of PTCDA/Ag(111). Orbitals of two vacancies interact to form bonding and anti-bonding pair of orbitals, shapes of which were visualized by scanning tunneling spectroscopy imaging. This hybridization can be readily understood by analogy with chemically interacting s-orbitals. We show that vacancy structures of more complex shapes demonstrate effects of multi-orbital hybridization.
[1] K.K. Gomes et al., Nature 483, 306-310 (2012) [2] K. Seufert et al., Nano Lett. 13, 6130-6135 (2013) [3] W-X. Qiu et al., arXiv:1609.01876v1 [4] R. Drost et al., arXiv:1611.01049v2