SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Magnetic Imaging Techniques I

MA 32.4: Vortrag

Mittwoch, 29. März 2023, 15:45–16:00, HSZ 401

Controlled surface-modification to revive shallow NV^--centers — •Toni Hache^1,5, Jeffrey N. Neethirajan^1,2,5, Domenico Paone^1,2,5, Dinesh Pinto^{1, 3}, Andrej Denisenko², Rainer Stöhr², Péter Udvarhelyi⁴, Anton Pershin⁴, Ádám Gali⁴, Jörg Wrachtrup^1,2, Klaus Kern^1,3, and Aparajita Singha¹ — ¹Max Planck Institute for Solid State Research — ²3rd Institute of Physics and Research Center SCoPE, University of Stuttgart — ³Institute de Physique, École Polytechnique Fédérale de Lausanne — ⁴Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, Hungarian Academy of Sciences — ⁵Equal contribution.

Nitrogen-vacancy (NV) centers in diamond have attracted an immense interest for non-invasive magnetic imaging and quantum sensing. All NV based magnetic sensing protocols rely on the negative charge state of this quantum sensor (NV^-). In this work we demonstrate dramatic charge state conversions within individual NV centers at cryogenic (4.7 K) and 2 · 10^-10 mbar ultra-high-vacuum (UHV) conditions. The NV centers are characterized based on autocorrelation measurements, ODMR contrast and emission spectra. Under these extreme conditions, each of these measurements indicate a significant decrease of the relative occupancy of the NV^- charge state. Furthermore, we note a slight recovery of the NV^- charge state by dosing water (H2O) on top of the diamond surface under UHV conditions. These results indicate that controlled surface treatments are essential for implementing NV center based quantum sensing protocols at cryogenic-UHV conditions.