论文标题
动态$^{14} \ rm n $ n $核自旋极化在钻石中
Dynamic $^{14}\rm N$ nuclear spin polarization in nitrogen-vacancy centers in diamond
论文作者
论文摘要
我们研究了钻石中氮气中氮的动态核自旋极化在实验和理论上的钻石中心，在从0到1100 g的广泛磁场上均覆盖了激发型水平的反杂交和地基状态抗螺旋磁场区域。特别注意研究较少的地面级反跨区域。核自旋极化是根据光学检测到的磁共振信号的测量来推断的。这些测量表明，在非常广泛的磁场中，可以实现非常大的（最高$ 96 \ pm 2 \％$）的核自旋极化，从大约400 g到磁场值，直至基本上超过了1024 g的地面抗跨跨磁场。地面水平的抗横断性，核自旋极化对该角度比激发态水平抗跨的附近更敏感。实际上，一定程度的十分之一的角度几乎可以完全破坏氮核的自旋极化。此外，我们从理论上研究了应变和光激发能力对核自旋极化的影响。
We studied the dynamic nuclear spin polarization of nitrogen in negatively charged nitrogen-vacancy (NV) centers in diamond both experimentally and theoretically over a wide range of magnetic fields from 0 to 1100 G covering both the excited-state level anti-crossing and the ground-state level anti-crossing magnetic field regions. Special attention was paid to the less studied ground-state level anti-crossing region. The nuclear spin polarization was inferred from measurements of the optically detected magnetic resonance signal. These measurements show that a very large (up to $96 \pm 2\%$) nuclear spin polarization of nitrogen can be achieved over a very broad range of magnetic field starting from around 400 G up to magnetic field values substantially exceeding the ground-state level anti-crossing at 1024 G. We measured the influence of angular deviations of the magnetic field from the NV axis on the nuclear spin polarization efficiency and found that, in the vicinity of the ground-state level anti-crossing, the nuclear spin polarization is more sensitive to this angle than in the vicinity of the excited-state level anti-crossing. Indeed, an angle as small as a tenth of a degree of arc can destroy almost completely the spin polarization of a nitrogen nucleus. In addition, we investigated theoretically the influence of strain and optical excitation power on the nuclear spin polarization.
