Local and bulk (13)C hyperpolarization in nitrogen-vacancy-centred diamonds at variable fields and orientations.
Local and bulk (13)C hyperpolarization in nitrogen-vacancy-centred diamonds at variable fields and orientations.
复制标题
在可变场和方向的氮气中心钻石中的局部和散装（13）C超极化。
DOI：
10.1038/ncomms9456
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发表时间：
2015-09-25
影响因子：
16.6
通讯作者：
Frydman L
中科院分区：
文献类型：
--
作者：
Álvarez GA;Bretschneider CO;Fischer R;London P;Kanda H;Onoda S;Isoya J;Gershoni D;Frydman L
极化核自旋在生物学、化学和物理学中具有根本的重要性。从体中的自由电子超极化13 C核的方法通常需要在低温下操作。室温方法靶向具有氮空位中心的金刚石可以缓解这种需求;然而，迄今提出的策略缺乏通用性，因为它们需要对磁场的强度和/或排列的严格条件。我们在这里报告的方法，实现有效的电子-13 C自旋对齐转移，兼容的磁场强度和磁场方向的金刚石晶体的广泛范围。这种多功能性的结果从相结合的相干微波和非相干激光诱导的耦合电子核自旋流形的选定的能量状态之间的过渡。13 C检测的核磁共振实验表明，这种超极化可以通过第一壳层或通过遥远的13 Cs在整个核体系综中转移。该方法为金刚石氮空位中心在核磁共振和量子信息处理中的应用开辟了新的前景。 用于增强磁共振灵敏度的核自旋的超极化通常可以在低温下实现。在这里，作者证明了13 C的室温极化来自于具有任意取向的金刚石中的氮空位的光泵浦电子。
Polarizing nuclear spins is of fundamental importance in biology, chemistry and physics. Methods for hyperpolarizing 13C nuclei from free electrons in bulk usually demand operation at cryogenic temperatures. Room temperature approaches targeting diamonds with nitrogen-vacancy centres could alleviate this need; however, hitherto proposed strategies lack generality as they demand stringent conditions on the strength and/or alignment of the magnetic field. We report here an approach for achieving efficient electron-13C spin-alignment transfers, compatible with a broad range of magnetic field strengths and field orientations with respect to the diamond crystal. This versatility results from combining coherent microwave- and incoherent laser-induced transitions between selected energy states of the coupled electron–nuclear spin manifold. 13C-detected nuclear magnetic resonance experiments demonstrate that this hyperpolarization can be transferred via first-shell or via distant 13Cs throughout the nuclear bulk ensemble. This method opens new perspectives for applications of diamond nitrogen-vacancy centres in nuclear magnetic resonance, and in quantum information processing. Hyperpolarization of nuclear spins for enhancing the sensitivity of magnetic resonance can typically be achieved at low temperatures. Here, the authors demonstrate room-temperature polarization of 13C derived from optically pumped electrons of nitrogen vacancies in diamonds with arbitrary orientations.