Nanoscale spin detection of copper ions using double electron-electron resonance at room temperature
Nanoscale spin detection of copper ions using double electron-electron resonance at room temperature
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DOI：
10.1103/physrevb.104.224412
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发表时间：
2021-01
影响因子：
3.7
通讯作者：
Kai Zhang;Shreya Ghosh;S. Saxena;M. Dutt
中科院分区：
文献类型：
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作者：
Kai Zhang;Shreya Ghosh;S. Saxena;M. Dutt
本文报道了在室温和低磁场条件下，利用金刚石中单自旋的双电子-电子共振对铜(Cu2+)离子进行了纳米尺度的自旋探测和电子顺磁共振(EPR)谱研究。我们测量了来自溶解在多赖氨酸中的氯化铜分子的线宽∼2−3 MHz的出乎意料的窄的电子顺磁共振共振。我们还观察到了单个Cu2+离子的相干Rabi振荡和超精细分裂，这可以用于动态核自旋极化和更高的自旋探测灵敏度。我们使用氯化铜分子的自旋哈密顿模型和预测的鹿响应的数值模拟来解释和分析这些观测结果，得到了敏感体积∼(250 Nm)3。这项工作将为生物分子和纳米材料中环境条件下的铜标记电子顺磁共振测量打开大门。
We report the nanoscale spin detection and electron paramagnetic resonance (EPR) spectrum of copper (Cu2+) ions via double electron-electron resonance with single spins in diamond at room temperature and low magnetic fields. We measure unexpectedly narrow EPR resonances with linewidths ∼ 2− 3 MHz from copper-chloride molecules dissolved in poly-lysine. We also observe coherent Rabi oscillations and hyperfine splitting from single Cu2+ ions, which could be used for dynamic nuclear spin polarization and higher sensitivity of spin detection. We interpret and analyze these observations using both spin hamiltonian modeling of the copper-chloride molecules and numerical simulations of the predicted DEER response, and obtain a sensing volume ∼ (250nm)3. This work will open the door for copper-labeled EPR measurements under ambient conditions in bio-molecules and nano-materials.