Reduction of surface spin-induced electron spin relaxations in nanodiamonds
Reduction of surface spin-induced electron spin relaxations in nanodiamonds
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DOI：
10.1063/5.0007599
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发表时间：
2020-08
期刊：
影响因子：
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通讯作者：
Zaili Peng;Jax Dallas;Susumu Takahashi
中科院分区：
文献类型：
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作者：
Zaili Peng;Jax Dallas;Susumu Takahashi
氮空位中心纳米金刚石（NDs）在量子传感领域具有广阔的应用前景。长自旋弛豫时间（$T_1$和$T_2$）对于量子应用中的高灵敏度至关重要。研究表明，表面自旋引起的磁场波动强烈影响NDs中的$T_1$和$T_2$。然而，它们的松弛机制尚未被完全理解。本文研究了NDs中单取代氮杂质（P1）中心$T_1$和$T_2$与表面自旋的关系。P1中心通常位于NV中心附近，是研究NV中心自旋弛豫过程的一个很好的模型系统。通过使用高频电子顺磁共振（EPR）光谱，我们验证了空气退火有效地去除表面自旋，并显着降低了它们对$T_1$的贡献。
Nanodiamonds (NDs) hosting nitrogen-vacancy (NV) centers are promising for applications of quantum sensing. Long spin relaxation times ($T_1$ and $T_2$) are critical for high sensitivity in quantum applications. It has been shown that fluctuations of magnetic fields due to surface spins strongly influences $T_1$ and $T_2$ in NDs. However, their relaxation mechanisms have yet to be fully understood. In this paper, we investigate the relation between surface spins and $T_1$ and $T_2$ of single-substitutional nitrogen impurity (P1) centers in NDs. The P1 centers located typically in the vicinity of NV centers are a great model system to study the spin relaxation processes of the NV centers. By employing high-frequency electron paramagnetic resonance (EPR) spectroscopy, we verify that air annealing removes surface spins efficiently and significantly reduces their contribution to $T_1$.