Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Nanostructures at Surfaces 1

O 6.9: Vortrag

Montag, 5. September 2022, 12:30–12:45, S052

Emulating organic molecular orbitals with artificial atoms on a surface — •E. Sierda, D. Badrtdinov, B. Kiraly, E. J. Knol, X. Huang, M. I. Katsnelson, G. C. Groenenboom, D. Wegner, M. Rösner, and A. A. Khajetoorians — Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands

Bottom-up strategies to emulate the orbital structure of organic compounds is an exciting prospect, especially for molecules that are complex, unstable or hard to isolate, e.g. cyclobutadiene or triangulene. A successful implementation of such an emulator requires creating and coupling artificial atoms with multi-orbital character and possibility for orbital hybridization, on a platform that does not couple to the emulated structure. We emulate the electronic structure of planar organic molecules, using coupled, bottom-up constructed quantum dots (QDs) composed of atomic ions. We illustrate that compact clusters of ions, created via atom manipulation, exhibit a well pronounced state, localized within the semiconductor bulk band gap. For a pair of such QDs, we observe two states and identify them as bonding and anti-bonding via spatial maps. Linear chains of QDs exhibit emulated linear combinations of atomic orbitals with both s- and p-like character. Furthermore, we construct artificial structures resembling sp2-hybridized organic molecules. A rich electronic structure with pronounced states is found in tunneling spectroscopy. By comparing their spatial maps with quantum-chemical simulations of the organic compound, we can identify the states as emulated organic orbitals, providing evidence for sp2 hybridization present in the artificial structures.