Increasing the coherence time of single electron spins in diamond by high temperature annealing

Boris Naydenov; Friedemann Reinhard; Anke Lämmle; V. Richter; Rafi Kalish; Ulrika F. S. D'Haenens-Johansson; Mark Newton; Fedor Jelezko; Jörg Wrachtrup

doi:10.1063/1.3527975

Increasing the coherence time of single electron spins in diamond by high temperature annealing

Materials Science 2015-05-20 v1 Quantum Physics

Authors: Boris Naydenov , Friedemann Reinhard , Anke Lämmle , V. Richter , Rafi Kalish , Ulrika F. S. D'Haenens-Johansson , Mark Newton , Fedor Jelezko , Jörg Wrachtrup

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Abstract

Negatively charged Nitrogen-Vacancy (NV $^-$ ) centers in diamond produced by ion implantation often show properties different from NVs created during the crystal growth. We observe that NVs created from nitrogen ions with four different energies (30-300 keV) show much shorter electron spin coherence time $T_2$ compared to the "natural" NVs and we could find any dependence of $T_2$ on the implantation energy. Moreover, we also find out that about 10% of them show switching from NV $^-$ to NV $^0$ . We develop a method to increase $T_2$ of single NV $^-$ centers by annealing the sample at $t=1200 {\circ}$ C whereas at the same time the fraction of the NVs showing discharging is greatly reduced.

Keywords

nitrogen-vacancy centers diamond electron spin coherence ion implantation high temperature annealing

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@article{arxiv.1012.0216,
  title  = {Increasing the coherence time of single electron spins in diamond by high temperature annealing},
  author = {Boris Naydenov and Friedemann Reinhard and Anke Lämmle and V. Richter and Rafi Kalish and Ulrika F. S. D'Haenens-Johansson and Mark Newton and Fedor Jelezko and Jörg Wrachtrup},
  journal= {arXiv preprint arXiv:1012.0216},
  year   = {2015}
}

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Accepted for publication in Appl. Phys. Lett

Increasing the coherence time of single electron spins in diamond by high temperature annealing

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