Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 49: Poster Nanostructures at Surfaces

O 49.8: Poster

Tuesday, March 18, 2025, 18:00–20:00, P2

Bottom-up realization of quasi-1D electronic states from Cs atoms on InSb(110) — •Niek Aarts, Annique Krieg, Emil Sierda, Danis Badrtdinov, Brian Kiraly, Elze Knol, Gerrit Groenenboom, Mikhail Katsnelson, Malte Rösner, Daniel Wegner, and Alexander Khajetoorians — Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands

1D-electronic systems are predicted to exhibit very different physical phenomena compared to 2D and 3D systems. Scanning tunnelling microscopy (STM) and spectroscopy (STS) provide a way to study 1D electronic systems on surfaces in a bottom-up approach with atomic-scale precision by utilising atomic manipulation.

Here, we study the electronic states of quasi-1D structures that result from coupling individual Cs atoms adsorbed on InSb(110) using low-temperature STM and STS. When constructing chains of Cs atoms, we observe the formation of quantized electronic states in energy with a modulated charge density along the chain. We can tune these electronic states by changing the length and Cs density of the chain. Modifying the chain length, changes the spacing of the electronic states. Changing the density of Cs atoms, changes the onset energy of the electronic states. We ascribe these observations to a 1D-particle in a box behavior for the lowest electronic states. For the electronic states at higher energy, we observe deviations from the simple particle in a box description. These deviations could be due to the onset of states with a higher order orbital symmetry or due to a coupling of these states to a bath.

Keywords: LT-STM; 1-dimensional; Bottom-up; Electronic structure; Particle in a box