SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 87: Focus Session: Scanning Probe Microscopy with Quartz Sensors III

O 87.1: Topical Talk

Thursday, March 30, 2023, 15:00–15:30, TRE Ma

Quartz-sensor detection for single-electron tunneling spectroscopy — •Jascha Repp — Department of Physics, University of Regensburg, 93040 Regensburg, Germany

We exploit the high sensitivity of qPlus-based [1] atomic force microscopy (AFM) to perform scanning tunneling microscopy (STM) and spectroscopy on molecules in absence of any conductance of the underlying substrate. Thereby, we gain access to out-of-equilibrium charge states that are out of reach for conventional STM [2]. Extending this technique by electronic pump-probe spectroscopy [3], we measured the triplet lifetime of an individual pentacene molecule on an insulating surface [4] and lifetime quenching by nearby oxygen molecules. Combined with radio-frequency magnetic-field driving we introduce AFM-based electron spin resonance and spin manipulation showing long spin coherence in single molecules.

References: [1] F. J. Giessibl, Appl. Phys. Lett. 73, 3956 (1998). [2] L. L. Patera et al., Nature 566, 245 (2019). [3] S. Loth et al., Science 329, 1628 (2010). [4] J. Peng et al., Science 373, 452 (2021).