Optical activation and detection of charge transport between individual colour centres in diamond
Optical activation and detection of charge transport between individual colour centres in diamond
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DOI：
10.1038/s41928-021-00656-z
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发表时间：
2021-10-01
影响因子：
34.3
通讯作者：
Meriles, Carlos A.
中科院分区：
文献类型：
--
作者：
Lozovoi, Artur;Jayakumar, Harishankar;Meriles, Carlos A.
共聚焦荧光显微镜和磁共振可用于诱导和探测金刚石中单个氮空位中心之间的电荷输运。了解半导体中色心对电荷载流子的捕获对于开发新型传感和量子信息处理非常重要，但实验通常涉及系综测量，通常受到缺陷邻近的影响。在这里，我们表明，共聚焦荧光显微镜和磁共振可以用来诱导和探测在室温下在金刚石中的单个氮空位中心之间的电荷传输。在我们的实验中，“源”氮空位经历光驱动的电离和复合循环，产生光生载流子流，其中之一随后被几微米外的“目标”氮空位捕获。我们使用自旋-电荷转换方案将源颜色中心的自旋状态编码为目标的电荷状态，这允许我们设置来自其他背景缺陷的载流子注入的上限。我们把我们的观测结果归因于未屏蔽的库仑势产生巨大的载流子俘获截面的作用，其数量级大于合奏测量的数量级。
Confocal fluorescence microscopy and magnetic resonance can be used to induce and probe charge transport between individual nitrogen-vacancy centres in diamond.Understanding the capture of charge carriers by colour centres in semiconductors is important for the development of novel forms of sensing and quantum information processing, but experiments typically involve ensemble measurements, often impacted by defect proximity. Here we show that confocal fluorescence microscopy and magnetic resonance can be used to induce and probe charge transport between individual nitrogen-vacancy centres in diamond at room temperature. In our experiments, a 'source' nitrogen vacancy undergoes optically driven cycles of ionization and recombination to produce a stream of photogenerated carriers, one of which is subsequently captured by a 'target' nitrogen vacancy several micrometres away. We use a spin-to-charge conversion scheme to encode the spin state of the source colour centre into the charge state of the target, which allows us to set an upper bound to carrier injection from other background defects. We attribute our observations to the action of unscreened Coulomb potentials producing giant carrier capture cross-sections, orders of magnitude greater than those measured in ensembles.