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FM: Fachverband Funktionsmaterialien

FM 11: Poster Session Functional Materials

FM 11.28: Poster

Dienstag, 10. März 2026, 18:00–20:30, P4

Local nanoscale probing of electron spins using NV centers in diamond — •Sergei Trofimov¹, Christos Thessalonikios¹, Victor Deinhart^2,3, Alexander Spyrantis², Lucas Tsunaki¹, Kseniia Volkova¹, Katja Höflich², and Boris Naydenov¹ — ¹Berlin Joint EPR Laboratory and Department Spins in Energy Conversion and Quantum Information Science (ASPIN), Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — ²Leibniz-Institut für Höchstfrequenztechnik, Ferdinand-Braun-Institut (FBH), Berlin, Germany — ³Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany

Substitutional nitrogen atoms in a diamond crystal (P1 centers) are crucial for creation of nitrogen-vacancy (NV) centers. However, P1’s electron spin generates paramagnetic noise that degrades the NV’s performance by shortening its coherence time. Bulk characterization methods of nitrogen concentration based on optical absorption or electron paramagnetic resonance often overlook local variations in the nitrogen content. In this work, we use a helium ion microscope to fabricate nanoscale NV center ensembles at predefined sites with a nano-scale resolution in a diamond crystal containing low concentrations of nitrogen. We then utilize these NV-based probes to measure the local P1 concentration on the level of 230 ppb using the double electron-electron resonance (DEER) technique. Moreover, by comparing the DEER spectra with numerical simulations, we determined the concentration of other unknown paramagnetic defects created during the ion implantation to be up to 15 ppb depending on the implantation dose.

Keywords: NV center; Double electron-electron resonance