Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Poster Spins on Surfaces at the Atomic Scale
O 45.5: Poster
Dienstag, 18. März 2025, 18:00–20:00, P2
A molecular spin on a scanning probe tip enables quantum sensing at the atomic scale — Taner Esat1,2, Dmitriy Borodin3,4, •Jeongmin Oh1,2, Andreas Heinrich3,4, Stefan Tautz1,2,5, Yujeong Bae3,4, and Ruslan Temirov1,2,6 — 1Peter Grünberg Institute (PGI-3), Forschungszentrum Jülich; Jülich, Germany — 2Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology; Jülich, Germany — 3Center for Quantum Nanoscience (QNS), Institute for Basic Science (IBS); Seoul, South Korea — 4Department of Physics, Ewha Womans University; Seoul, South Korea — 5Experimentalphysik IV A, RWTH Aachen University; Aachen, Germany — 6Faculty of Mathematics and Natural Sciences, Institute of Physics II, University of Cologne; Cologne, Germany
In this work, we fabricate a single-molecule quantum sensor on a scanning tunneling microscope (STM) tip by attaching Fe atoms and a PTCDA (3,4,9,10-perylenetetracarboxylic-dianhydride) molecule to the tip apex. The PTCDA molecule is a spin-1/2 system on the STM tip and serves as a two-level quantum system in a magnetic field. We probe this molecular spin system by electron spin resonance and achieve about 100 neV resolution in energy. The functionality of the quantum sensor we demonstrate by measuring the magnetic and electric dipole fields emanating from a single Fe atom and an Ag dimer on an Ag(111) surface with sub-angstrom spatial resolution [T. Esat, D. Borodin, J. Oh et al. Nat. Nanotechnol. 19, 1466 (2024)].
Keywords: Quantum sensor; Atomic-scale manipulation; Electron spin resonance (ESR); Scanning tunneling microscope (STM); Sensing