@article{oai:repo.qst.go.jp:00048630,
 author = {Yamano, Hayate and Kawai, Sora and Kanami, Kato and Kageura, Taisuke and Inaba, Masafumi and Okada, Takuma and Higashimata, Itaru and Haruyama, Moriyoshi and Tanii, Takashi and Yamada, Keisuke and Onoda, Shinobu and Kada, Wataru and Osamu, Hanaizumi and Teraji, Tokuyuki and Isoya, Junichi and Kawarada, Hiroshi and 春山 盛善 and 山田 圭介 and 小野田 忍},
 issue = {4S},
 journal = {Japanese Journal of Applied Physics 56},
 month = {Mar},
 note = {We investigated the charge state stability and coherence properties of near-surface single nitrogen vacancy (NV) centers in 12C-enriched diamond
for potential use in nanoscale magnetic field sensing applications. The stability of charge states in negatively charged NV centers (NV%) was
evaluated using one of the pulsed optically detected magnetic resonance measurements, Rabi oscillation measurements. During the accumulation
of Rabi oscillations, an unstable shallow NV% was converted to a neutral state. As a result, the contrast of Rabi oscillations degraded, depending on
charge state stability. We stabilized the NV% state of very shallow NV centers (>2.6 + 1.1 nm from the surface) created by 1.2 keV nitrogen ion
implantation by diamond surface modification, UV/ozone exposure, and oxygen annealing. This improvement indicates that we can suppress the
upward surface band bending and surface potential fluctuations through Fermi level pinning originating from oxygen-terminated diamond surfaces.},
 pages = {04CK08-1--04CK08-7},
 title = {Charge state stabilization of shallow nitrogen vacancy centers in diamond by oxygen surface modification},
 volume = {56},
 year = {2017}
}