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O: Fachverband Oberflächenphysik
O 59: Spins on Surfaces at the Atomic Scale I
O 59.1: Vortrag
Mittwoch, 19. März 2025, 10:30–10:45, H6
Quantum spin engineering in bottom-up assembled molecular nanostructures — •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, Germany — 2Jülich Aachen Research Alliance, Germany — 3Center for Quantum Nanoscience, Institute for Basic Science, South Korea — 4Ewha Womans University, South Korea — 5RWTH Aachen University, Germany — 6University of Cologne, Germany
Scanning tunneling microscopy (STM) is a powerful technique for fabricating and studying artificial nanostructures with purpose-engineered quantum states. Using the manipulation capabilities of the STM, we place aromatic molecules in an upright geometry on a pedestal of two transition metal atoms on the surface [1] and on the STM tip. These nanostructures carry electron spins that are well decoupled from the metallic substrate [2]. Based on this, we fabricate a single-molecule quantum sensor at the apex of the STM tip and address it by electron spin resonance. We use this sensor to measure the magnetic and electric dipole fields emanating from a single atom with sub-angstrom spatial resolution [3]. Finally, we show that varying the transition metal atoms in the pedestal alters the spin state of the molecular nanostructures, leading to exceptionally long spin lifetimes of up to several minutes. [1] Esat et al., Nature 558, 573 (2018) [2] Esat et al., Phys. Rev. Research 5, 033200 (2023) [3] Esat et al., Nat. Nanotechnol. 19, 1466 (2024)
Keywords: Quantum sensing; Spin engineering; Scanning tunneling microscopy; Electron spin resonance