Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 9: Organic molecules on inorganic substrates: electronic, optical and other properties I
O 9.5: Vortrag
Montag, 9. März 2026, 16:00–16:15, HSZ/0201
Orbitals of Artificial Atoms in a Gapped Two-Dimensional Vacuum — Mong-Wen Gu1,2, Aizhan Sabitova1,2, Taner Esat1,2, Christian Wagner1,2, F. Stefan Tautz1,2,3, Aleksandr Rodin4,5, and •Ruslan Temirov1,2,6 — 1PGI-3, Forschungszentrum Jülich, Germany — 2JARA, Fundamentals of Future Information Technology, Germany — 3RWTH Aachen, Germany — 4NUS, Singapore — 5Yale-NUS College, Singapore — 6University of Cologne, Germany
Artificial atoms–engineered nanostructures that confine electronic states–offer a route toward atom-by-atom design of electronic functionality. In this work, we use low-temperature STM and STS to study single-molecule vacancies in a commensurate PTCDA/Ag(111) monolayer, which act as attractive potentials for the two-dimensional interface-state electrons.
Using feature-detection STS [1,2], we directly image the vacancy-induced bound states and identify artificial analogues of s- and p-orbitals that split from the parabolic band minimum and hybridise when two vacancies are brought into proximity. Beyond these conventional orbital analogues, the periodically corrugated interface-state band hosts partial band gaps that support additional quasi-localised states with no counterparts in natural atoms. Tight-binding simulations reproduce these high-energy states and reveal their origin in the gap regions of the 2D dispersion.
[1] A. Sabitova, et. al., PRB 98, 205429 (2018), [2] J. Martinez-Castro, Commun. Mater. 3, 57 (2022)
Keywords: scanning tunneling spectroscopy; scanning tunneling microscopy; artifitial atoms; molecular adsorption; molecular manipulation