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Robust nuclear hyperpolarization driven by strongly coupled nitrogen vacancy centers
Journal of Applied Physics ( IF 3.2 ) Pub Date : 2021-09-08 , DOI: 10.1063/5.0052790
Ralf Wunderlich 1 , Robert Staacke 1 , Wolfgang Knolle 2 , Bernd Abel 2 , Jürgen Haase 1 , Jan Meijer 1
Affiliation  

Nuclear magnetic resonance techniques are widely used in the natural sciences but they lack sensitivity. Therefore, large sample volumes or long measurement times are necessary. In this work, we investigate the polarization of bulk 13C nuclei in a diamond above the thermal equilibrium at room temperature. Previously studied mechanisms utilize direct coupling to nitrogen vacancy centers or the additional assistance of substitutional nitrogen impurities for this purpose. We exploit strongly coupled nitrogen vacancy centers as polarization sources. We study two approaches to transfer the optically induced polarization of the electron spins of the nitrogen vacancy centers to nearby nuclear spins. First, the electron-nuclear polarization transfer is achieved by energy matching conditions or, second, by magnetic field sweeps inducing Landau–Zener-like transitions. Simulations according to a quantum mechanical system consisting of two coupled nitrogen vacancy centers and a weakly coupled 13C spin show an excellent agreement with the experimental data. Both approaches allow a reduction of the measurement time by roughly three orders of magnitude.

中文翻译:

由强耦合氮空位中心驱动的稳健核超极化

核磁共振技术在自然科学中被广泛使用,但它们缺乏敏感性。因此,需要大样本量或长测量时间。在这项工作中,我们研究了体的极化13钻石中的 C 核高于室温下的热平衡。先前研究的机制利用与氮空位中心的直接耦合或替代氮杂质的额外辅助用于此目的。我们利用强耦合氮空位中心作为极化源。我们研究了两种将氮空位中心的电子自旋的光致极化转移到附近核自旋的方法。首先,电子-核极化转移是通过能量匹配条件实现的,其次,通过磁场扫描诱导朗道-齐纳样跃迁。根据由两个耦合的氮空位中心和一个弱耦合的量子力学系统进行的模拟13C 自旋与实验数据非常吻合。这两种方法都允许将测量时间减少大约三个数量级。
更新日期:2021-09-15
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