Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 93: Scanning Probe Techniques: Method Development

O 93.6: Vortrag

Donnerstag, 21. März 2024, 16:15–16:30, MA 043

Systematic protocol to prepare SPM tips for Scanning Quantum Dot Microscopy — •Tim Dierker, Paul Laubrock, and Philipp Rahe — Universität Osnabrück

Scanning probe microscopy (SPM) is an established family of techniques for high-resolution measurements of surfaces. One of its variants is scanning quantum dot microscopy (SQDM) [1], a technique that enables the quantitative mapping of the electrostatic potential at the atomic scale [2]. Central for SQDM is the controlled functionalization of the SPM tip with a single molecule that acts as a quantum dot. In this work we perform low-temperature manipulation experiments with 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) molecules on Ag(111) with a combined scanning tunneling and atomic force microscope system. From the classification of manipulation and pick-up data we develop a routine to isolate single molecules from the edges of PTCDA islands and to attach them to the tip. The experimental observations allow to condense the physical complexity of the tip-molecule system into an instructive flowchart for an efficient preparation of SQDM tips.

[1] C. Wagner et al., PRL 115, 026101 (2015)

[2] C. Wagner et al., Nat. Mater. 18, 853 (2019)

Keywords: SQDM; PTCDA; STM; AFM; Manipulation