Carbon-13 dynamic nuclear polarization in diamond via a microwave-free integrated cross effect
Carbon-13 dynamic nuclear polarization in diamond via a microwave-free integrated cross effect
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通过无微波集成交叉效应实现金刚石中的碳 13 动态核极化
DOI：
10.1073/pnas.1908780116
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Meriles, Carlos A.
中科院分区：
文献类型：
--
作者：
Henshaw, Jacob;Pagliero, Daniela;Zangara, Pablo R.;Franzoni, María B.;Ajoy, Ashok;Acosta, Rodolfo H.;Reimer, Jeffrey A.;Pines, Alexander;Meriles, Carlos A.
色心半导体正在成为室温或接近室温下低场动态核极化（DNP）的有前途的源材料，但超精细展宽、对磁场异质性的敏感性以及其他顺磁缺陷引起的核自旋弛豫设置了难以规避的实际限制。在这里，我们利用金刚石中的氮空位 (NV) 中心与替代性氮杂质（即所谓的 P1 中心）结合，探索了一种色心辅助 DNP 的替代途径。在能级反交叉条件附近（其中 P1 塞曼分裂与 NV 自旋跃迁之一匹配）工作，我们通过使用连续磁场扫描和连续光学激发，展示了高效的无微波 13C DNP。极化的幅度和符号可以通过调整每个周期中从低到高和从高到低的磁场扫描速率来控制，以便一个比另一个快得多。通过比较不同晶体取向的 13 C DNP 响应，我们表明该过程对于磁场/NV未对准具有鲁棒性，这一特征使得本技术适用于金刚石粉末和场不均匀的设置。浅层 NV 的应用可以利用表面顺磁缺陷和外核之间更大的物理接近性，有效地极化与金刚石晶体接触的目标样品。
Color-center–hosting semiconductors are emerging as promising source materials for low-field dynamic nuclear polarization (DNP) at or near room temperature, but hyperfine broadening, susceptibility to magnetic field heterogeneity, and nuclear spin relaxation induced by other paramagnetic defects set practical constraints difficult to circumvent. Here, we explore an alternate route to color-center–assisted DNP using nitrogen-vacancy (NV) centers in diamond coupled to substitutional nitrogen impurities, the so-called P1 centers. Working near the level anticrossing condition—where the P1 Zeeman splitting matches one of the NV spin transitions—we demonstrate efficient microwave-free13C DNP through the use of consecutive magnetic field sweeps and continuous optical excitation. The amplitude and sign of the polarization can be controlled by adjusting the low-to-high and high-to-low magnetic field sweep rates in each cycle so that one is much faster than the other. By comparing the13C DNP response for different crystal orientations, we show that the process is robust to magnetic field/NV misalignment, a feature that makes the present technique suitable to diamond powders and settings where the field is heterogeneous. Applications to shallow NVs could capitalize on the greater physical proximity between surface paramagnetic defects and outer nuclei to efficiently polarize target samples in contact with the diamond crystal.
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DOI：
--
发表时间：
1973
期刊：
影响因子：
--
作者：
J. Wolfe
通讯作者：
J. Wolfe
影响因子：
13.6
作者：
Schwartz I;Scheuer J;Tratzmiller B;Müller S;Chen Q;Dhand I;Wang ZY;Müller C;Naydenov B;Jelezko F;Plenio MB
通讯作者：
Plenio MB
影响因子：
19.6
作者：
Cai, Jianming;Retzker, Alex;Plenio, Martin B.
通讯作者：
Plenio, Martin B.
混合金刚石量子寄存器中基于超极化弛豫测量的核 T 1 噪声光谱
DOI：
--
发表时间：
2019
期刊：
影响因子：
--
作者：
A. Ajoy;B. Safvati;R. Nazaryan;J. Oon;B. Han;P. Raghavan;R. Nirodi;A. Aguilar;K. Liu;X. Cai;X. Lv;E. Druga;C. Ramanathan;J. Reimer;C. Meriles;D. Suter;A. Pines
通讯作者：
A. Pines
影响因子：
16.6
作者：
Rej E;Gaebel T;Boele T;Waddington DE;Reilly DJ
通讯作者：
Reilly DJ