Multispin-assisted optical pumping of bulk C13 nuclear spin polarization in diamond
Multispin-assisted optical pumping of bulk C13 nuclear spin polarization in diamond
复制标题
金刚石中体 C13 核自旋极化的多自旋辅助光泵浦
DOI：
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
C. Meriles
中科院分区：
文献类型：
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作者：
D. Pagliero;K. R. K. Rao;P. Zangara;S. Dhomkar;Henry H. Wong;A. Abril;N. Aslam;A. Parker;J. King;C. Avalos;A. Ajoy;J. Wrachtrup;A. Pines;C. Meriles
金刚石中氮空位（NV）中心最显着的特性之一是光学照射几乎完全抑制其电子自旋，这一特征可以用来抑制附近的其他自旋物种。在这里，我们使用场循环核磁共振（NMR）研究了室温下金刚石中NVs到13 C自旋的自旋极化转移机制。我们专注于51 mT附近的动力学，在那里一个偶然的组合，电子和核自旋水平之间的能量匹配条件产生替代极化转移通道。通过监测13 C自旋极化与外加磁场的函数关系，我们表明13 C自旋抽运是通过涉及NV-自旋以及邻近P1中心的电子和核自旋的多自旋交叉弛豫过程发生的。此外，我们发现，这种机制是不敏感的相对于磁场的晶体取向，虽然13 C偏振的绝对水平-达到最佳条件下的~3%-可以根据光泵浦效率，光生载流子和激光诱导加热之间的相互作用而变化。
One of the most remarkable properties of the nitrogen-vacancy (NV) center in diamond is that optical illumination initializes its electronic spin almost completely, a feature that can be exploited to polarize other spin species in their proximity. Here we use field-cycled nuclear magnetic resonance (NMR) to investigate the mechanisms of spin polarization transfer from NVs to 13C spins in diamond at room temperature. We focus on the dynamics near 51 mT, where a fortuitous combination of energy matching conditions between electron and nuclear spin levels gives rise to alternative polarization transfer channels. By monitoring the 13C spin polarization as a function of the applied magnetic field, we show 13C spin pumping takes place via a multi-spin cross relaxation process involving the NV- spin and the electronic and nuclear spins of neighboring P1 centers. Further, we find that this mechanism is insensitive to the crystal orientation relative to the magnetic field, although the absolute level of 13C polarization - reaching up to ~3% under optimal conditions - can vary substantially depending on the interplay between optical pumping efficiency, photo-generated carriers, and laser-induced heating.
影响因子：
4.4
作者：
Hu, Kan-Nian;Bajaj, Vikram S.;Griffin, Robert G.
通讯作者：
Griffin, Robert G.
影响因子：
3.7
作者：
Green B
通讯作者：
Green B
影响因子：
3.7
作者：
Rao, K. Rama Koteswara;Suter, Dieter
通讯作者：
Suter, Dieter