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MA: Fachverband Magnetismus
MA 37: Magnetic Imaging Techniques
MA 37.9: Vortrag
Donnerstag, 20. März 2025, 17:15–17:30, H16
Investigation of charge-state stability in shallow NV centers with surface treatments — •Atharva Paranjape1, Olga Shevtsova1, Lisa Ebo1, Toni Hache1,2, Rainer Stöhr2, Jörg Wrachtrup2, and Aparajita Singha1,3 — 1Max Planck Institute for Solid State Research, Stuttgart — 23rd Institute of Physics and Research Center SCoPE, University of Stuttgart — 3IFMP, Technical University of Dresden
Nitrogen-vacancy (NV) centers in diamond are optically active defects which can be used for precise measurement of magnetic fields. While near-surface NV centers can provide high spatial resolution in magnetic imaging, they also face charge-state instability, which is aggravated in in ultra-high-vacuum (UHV). Here we aim to develop surface-treatment methods to reduce charge-state instability of shallow (< 10 nm from surface) NV centers in UHV conditions. We show that a TiO2 coating using Atomic Layer Deposition (ALD) on nanostructured diamond stabilizes the charge state by modifying the local environment. These experiments are crucial for the development of a scanning NV magnetometer in UHV with a high spatial resolution.
Keywords: NV center; Shallow NV; Surface treatment; UHV