Electrical control of deep NV centers in diamond by means of sub-superficial graphitic micro-electrodes
Electrical control of deep NV centers in diamond by means of sub-superficial graphitic micro-electrodes
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DOI：
10.1016/j.carbon.2016.11.031
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发表时间：
2017-03-01
期刊：
影响因子：
10.9
通讯作者：
Olivero, P.
中科院分区：
文献类型：
--
作者：
Forneris, J.;Tchernij, S. Ditalia;Olivero, P.
在从量子传感到量子计算的应用中，金刚石中氮空位（NV）中心的电荷状态的控制对于稳定其量子光学性质至关重要。利用6 MeV的C3+扫描微束在金刚石中制备了埋入式电流注入石墨微电极。利用电极来控制位于电极间间隙区域中的次表面NV 0中心系综的负（NV-）和中性（NV 0）电荷状态的相对群体的变化。光致发光光谱表现出高达40%的NV-人口的电诱导增加的NV 0电荷状态的费用，与线性依赖于在施加的偏压小于350 V的注入电流，并解释为在NV 0网站的电子捕获的结果。在类似于350 V偏压下的突然电流增加导致来自NV 0中心的强电致发光，此外在563.5 nm和580 nm处的两条光谱尖锐的发射线在光学激发下不可见并且归因于自间隙缺陷。这些结果揭示了新的可能性，在电子控制的NV中心的电荷状态位于金刚石块体，其特征在于较长的自旋相干时间。(C)2016爱思唯尔有限公司版权所有
The control of the charge state of nitrogen-vacancy (NV) centers in diamond is of primary importance for the stabilization of their quantum-optical properties, in applications ranging from quantum sensing to quantum computing. In this work buried current-injecting graphitic micro-electrodes were fabricated in bulk diamond by means of a 6 MeV C3+ scanning micro-beam. The electrodes were exploited to control the variation in the relative population of the negative (NV-) and neutral (NV0) charge states of a sub superficial NV0 centers ensemble located in the inter-electrode gap region. Photoluminescence spectra exhibited an electrically-induced increase up to 40% in the NV- population at the expense of the NV0 charge state, with a linear dependence from the injected current at applied biases smaller than 350 V, and was interpreted as the result of electron trapping at NV0 sites. An abrupt current increase at similar to 350 V bias resulted in a strong electroluminescence from the NV0 centers, in addition to two spectrally sharp emission lines at 563.5 nm and 580 nm, not visible under optical excitation and attributed to self interstitial defects. These results disclose new possibilities in the electrical control of the charge state of NV centers located in the diamond bulk, which are characterized by longer spin coherence times. (C) 2016 Elsevier Ltd. All rights reserved.