Graduate School of Fundamental Science and Technology, Keio University, Yokohama 223-8522, Japan.
Nano Lett. 2012 Apr 11;12(4):2083-7. doi: 10.1021/nl300350r. Epub 2012 Mar 21.
We have studied optical and spin properties of near-surface nitrogen-vacancy (NV) centers incorporated during chemical vapor phase growth of isotopically purified (12)C single-crystal diamond layers. The spectral diffusion-limited line width of zero-phonon luminescence from the NV centers is 1.2 ± 0.5 GHz, a considerable improvement over that of NV centers formed by ion implantation and annealing. Enhanced spin dephasing times (T(2)* ≈ 90 μs, T(2) ≈ 1.7 ms) due to the reduction of (13)C nuclear spins persist even for NV centers placed within 100 nm of the surface.
我们研究了在化学气相沉积生长的同位素纯化 (12)C 单晶金刚石层过程中掺入的近表面氮空位 (NV) 中心的光学和自旋性质。NV 中心的零声子发光的光谱扩散限制线宽为 1.2 ± 0.5GHz，这比离子注入和退火形成的 NV 中心有了相当大的改善。即使 NV 中心位于表面 100nm 以内，由于 (13)C 核自旋的减少，自旋退相时间 (T(2)* ≈ 90 μs，T(2) ≈ 1.7ms) 也得到增强。
