SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Poster Session I: Nanostructures at surfaces I
O 14.9: Poster
Montag, 1. März 2021, 10:30–12:30, P
A molecular quantum ring formed from a π-conjugated macrocycle — Chris J. Judd1, Anton S. Nizovtsev2,3,4, Rikke Plougmann1, Dmitry V. Kondratuk5, Harry L. Anderson5, Elena Besley2, and •Alex Saywell1 — 1School of Physics & Astronomy, University of Nottingham, UK. — 2School of Chemistry, University of Nottingham, UK. — 3Nikolaev Institute of Inorganic Chemistry, Russian Academy of Sciences, Russian Federation. — 4Novosibirsk State University, Russian Federation. — 5Department of Chemistry, University of Oxford, UK.
Quantum rings are structures that facilitate phase-coherent electron motion around a closed path and exhibit quantum phenomena; e.g. persistent currents and the Aharonov-Bohm effect. Our approach utilises cyclic porphyrin polymers, possessing a delocalised π-conjugated electronic structure [1], as molecular quantum rings.
We present details from our recent work [2] where the electronic structure of a molecular quantum ring (a 40 unit cyclic porphyrin polymer within stacks of 2-3 rings supported on a Ag(111) substrate) is characterised via scanning tunnelling microscopy (STM) and scanning tunnelling spectroscopy (STS). Combining density functional theory and tight binding calculations, in concert with experimental data, we interpret the experimentally obtained electronic structure in terms of quantum states confined around the π-conjugated macrocycle.
[1]M.D. Peeks,et al., Nature 541, 200 (2017).[2]C.J. Judd, et al., Phys.Rev.Lett. 125, 206803 (2020).