Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Magnetic Imaging Techniques
MA 2.4: Vortrag
Montag, 5. September 2022, 10:15–10:30, H37
Charge State Instabilities of shallow Nitrogen-Vacancy Centers in Diamond at Cryogenic Ultra-High-Vacuum Conditions — Domenico Paone1,2,5, •Toni Hache1,5, Jeffrey N. Neethirajan1,2,5, Dinesh Pinto1, 3, Andrej Denisenko2, Rainer Stöhr2, Péter Udvarhelyi4, Ádám Gali4, Aparajita Singha1, Jörg Wrachtrup1,2, and Klaus Kern1,3 — 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.