Berlin 2024 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: KFM Poster Session

KFM 9.25: Poster

Monday, March 18, 2024, 18:00–20:00, Poster E

KPFM imaging and magnetic resonance detection of single nitrogen-vacancy centers in diamond — •Sergei Trofimov, Klaus Lips, and Boris Naydenov — Berlin Joint EPR Laboratory and Department Spins in Energy Conversion and Quantum Information Science (ASPIN), Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany

Nitrogen-vacancy (NV) centers are color defects in diamond that are used for quantum sensing with high sensitivity and nano-scale spatial resolution. The spin-dependent luminescence allows optical readout of the NV spin state. Furthermore, electrical detection of NV centers, based on spin-dependent photocurrent, has been recently reported [1]. It opens a route to manufacturing compact sensors utilizing NV centers.

Here we present an alternative detection scheme – photovoltage imaging of single shallow NV centers using Kelvin probe force microscopy (KPFM) under laser excitation with moderate power (less than 1 mW). To conduct these experiments, a confocal microscope was combined with an AFM system, where scanning probe and optical imaging could be performed simultaneously. Moreover, we demonstrate that the electron spin state of single NV centers can also be detected with KPFM. We refer to this technique as VDMR (voltage-detected magnetic resonance). The results suggest that photovoltage detection of NV centers could be another solution on the way to compact quantum sensing devices.

[1] P. Siyushev et al., Science 363, 728 (2019).

Keywords: NV center; KPFM