Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 45: Poster Spins on Surfaces at the Atomic Scale

O 45.13: Poster

Dienstag, 18. März 2025, 18:00–20:00, P2

Nanoscale Control of Quantum States in Radical Molecules on Superconducting Pb(111) — •Chao Li, Jung-Ching Liu, Outhmane Chahib, Thilo Glatzel, Rémy Pawlak, and Ernst Meyer — Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.

Superconducting surfaces hosting magnetic impurities provide a promising framework for applications in quantum technology. Here, we demonstrate the manipulation of magnetic states in the radical molecule 4,5,9,10-tetrabromo-1,3,6,8-tetraazapyrene (TBTAP) deposited on a Pb(111) superconducting surface, utilizing low-temperature scanning tunneling microscopy. Tunneling spectroscopy reveals the presence of Yu-Shiba-Rusinov (YSR) states near the Fermi level for isolated TBTAP molecules. By varying the tip-molecule distance, we induce a quantum phase transition between singlet and doublet ground states. Furthermore, introducing a second TBTAP molecule enables tuning of the YSR state position through modifications in relative distance and orientation, with specific configurations leading to the splitting of YSR states. Extended molecular chains, up to pentamers, exhibit periodic patterns of charged and neutral molecules, where even-numbered chains form a distinct charged dimer structure at one terminus. This dimer position can be manipulated, allowing for information encoding within the chain.

Keywords: Yu-Shiba-Rusinov States; Radical molecule; STM; Molecular manipulation; Superconductors