SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 15: Spins on Surfaces at the Atomic Scale II

O 15.1: Vortrag

Montag, 27. März 2023, 15:00–15:15, REC C 213

Electron-spin resonance atomic force microscopy — •Lisanne Sellies, Raffael Spachtholz, Philipp Scheuerer, and Jascha Repp — University of Regensburg, Regensburg, Germany

Recently, we combined the high energy resolution of electron spin resonance (ESR) with the spatial resolution offered by atomic force microscopy (AFM). This ESR-AFM technique relies on driving electron spin transitions between the non-equilibrium triplet state levels of a single molecule. Since these triplet states typically have different lifetimes, driving such transitions modifies the overall triplet lifetime [1,2], which can be detected by an electronic pump-probe scheme [3].

ESR-AFM allows to measure ESR signals with a sub-nanoelectronvolt energy resolution, as we demonstrated for pentacene on thick NaCl films. Thereby, molecules only differing in their isotopic configuration can be distinguished. Moreover, due to the minimally invasive nature of the ESR-AFM technique, the electron spins of pentacene can be coherently manipulated over tens of microseconds. After introducing ESR-AFM, recent results obtained by this technique will be presented.

References: [1] Köhler et al. (1993). Nature, 363(6426), 242-244. [2] Wrachtrup et al. (1993). Nature, 363(6426), 244-245. [3] Peng et al. (2021). Science, 373(6553), 452-456.