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arXiv 1409.8258cond-mat.mtrl-sci
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CVD金刚石层中氮空位中心的温度依赖性产生

Temperature dependent creation of nitrogen-vacancy centers in CVD diamond layers

A. Tallaire, M. Lesik, V. Jacques, S. Pezzagna, V. Mille, O. Brinza, J. Meijer, B. Abel, J. -F. Roch, A. Gicquel, J. Achard

摘要:

在这项工作中,我们探索的能力,等离子体辅助化学气相沉积(PACVD)在高功率密度下操作,以生产薄的高品质的金刚石层与负电荷的氮空位(NV-)中心的受控掺杂。这种发光缺陷具有特定的物理特性,使其适合作为一个可寻址的固态电子自旋测量磁场与前所未有的灵敏度。为此,理想情况下,相对大量的NV-中心(> 10^12 cm^-3)应该位于靠近表面的薄金刚石层(几十nm)中,这对于使用PACVD技术实现特别具有挑战性。在这里,我们表明,有意的温度变化可以被利用来调整生长过程中的NV-创建效率,允许工程复杂的堆叠结构与可变掺杂。因为这种温度变化可以快速进行,并且气相组成没有任何变化,所以可以生长薄层。测量结果表明,尽管温度变化,使用这种技术结合的发光中心表现出自旋相干性的性质类似于超纯体晶体中达到的那些,这表明它们可以成功地用于磁力测量应用。

英文摘要:

In this work, we explore the ability of plasma assisted chemical vapor deposition (PACVD) operating under high power densities to produce thin high-quality diamond layers with a controlled doping with negatively-charged nitrogen-vacancy (NV-) centers. This luminescent defect possesses specific physical characteristics that make it suitable as an addressable solid-state electron spin for measuring magnetic fields with unprecedented sensitivity. To this aim, a relatively large number of NV- centers (> 10^12 cm^-3) should ideally be located in a thin diamond layer (a few tens of nm) close to the surface which is particularly challenging to achieve with the PACVD technique. Here we show that intentional temperature variations can be exploited to tune NV- creation efficiency during growth, allowing engineering complex stacking structures with a variable doping. Because such a temperature variation can be performed quickly and without any change of the gas phase composition, thin layers can be grown. Measurements show that despite the temperature variations, the luminescent centers incorporated using this technique exhibit spin coherence properties similar to those reached in ultra-pure bulk crystals, which suggests that they could be successfully employed in magnetometry applications.

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