Dopant-assisted stabilization of negatively charged single nitrogen-vacancy centers in phosphorus-doped diamond at low temperatures

• URL: http://arxiv.org/abs/2305.15160v1
• Date: Wed, 24 May 2023 13:53:10 GMT
• Title: Dopant-assisted stabilization of negatively charged single nitrogen-vacancy centers in phosphorus-doped diamond at low temperatures
• Authors: Jianpei Geng, Tetyana Shalomayeva, Mariia Gryzlova, Amlan Mukherjee, Santo Santonocito, Dzhavid Dzhavadzade, Durga Dasari, Hiromitsu Kato, Rainer St\"ohr, Andrej Denisenko, Norikazu Mizuochi, and J\"org Wrachtrup
• Abstract summary: Charge state instabilities have been a bottleneck for the implementation of solid-state spin systems. Here we investigate the stabilization of negatively charged nitrogen-vacancy centers in phosphorus-doped diamond at liquid helium temperatures.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Charge state instabilities have been a bottleneck for the implementation of solid-state spin systems and pose a major challenge to the development of spin-based quantum technologies. Here we investigate the stabilization of negatively charged nitrogen-vacancy (NV$^-$) centers in phosphorus-doped diamond at liquid helium temperatures. Photoionization of phosphorous donors in conjunction with charge diffusion at the nanoscale enhances NV$^0$ to NV$^-$ conversion and stabilizes the NV$^-$ charge state without the need for an additional repump laser. The phosphorus-assisted stabilization is explored and confirmed both with experiments and our theoretical model. Stable photoluminescence-excitation spectra are obtained for NV$^-$ centers created during the growth. The fluorescence is continuously recorded under resonant excitation to real-time monitor the charge state and the ionization and recombination rates are extracted from time traces. We find a linear laser power dependence of the recombination rate as opposed to the conventional quadratic dependence, which is attributed to the photo-ionization of phosphorus atoms.

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