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O: Fachverband Oberflächenphysik

O 17: Spins on surfaces at the atomic scale – Poster

O 17.3: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Development of Time-Resolved Pump-probe SP-STS for Ultrafast Spin Dynamics in SAM — •Yannick Noettger¹ and Artem Odobesko² — ¹Wuerzburg University — ²Wuerzburg University

Achieving coherent control of Single Atom Magnets (SAMs) is necessary for their use in quantum technologies and requires fundamental understanding of their spin dynamics on the atomic scale. Scanning tunneling microscopy (STM) provides a unique platform for probing and manipulating SAMs with atomic precision. One major challenge is minimizing coupling of the SAM to the surrounding as substrate-mediated relaxation strongly limits coherence and lifetime. Usually this is done by placing the SAM on a thin insulating layer on a metal substrate. We used an extended approach by combining the decoupling layer with a superconducting substrate, potentially enabling enhanced lifetimes due to the gap in the SC density of states. We investigate NaCl/Cu(111)/NbOx heterostructures grown by e-beam evaporation, which exhibit substrate induced superconductivity within the Cu(111)-layer up to a film thickness of 3ML. NaCl deposition on Cu(111)/NbOx was achieved, however showing very different growth characteristics than on bare Cu(111). Furthermore we implemented an all-electrical pump-probe spectroscopy scheme into our existing STM setup demonstrating functionalization and precise synchronization with the Lock-In Amplifier, although pump-probe measurements on single Fe atoms on Cu2N/Cu(001) did not yield any measurable lifetimes, highlighting limitations of our current STM setup.

Keywords: Spin Polarized Scanning Tunneling Microscopy; Pump-probe measurements; Single Atom Magnetism