Nanoscale spin detection of copper ions using double electron-electron resonance at room temperature

• URL: http://arxiv.org/abs/2101.02650v2
• Date: Tue, 31 Aug 2021 19:19:47 GMT
• Title: Nanoscale spin detection of copper ions using double electron-electron resonance at room temperature
• Authors: Kai Zhang and Shreya Ghosh and Sunil Saxena and M. V. Gurudev Dutt
• Abstract summary: We report the nanoscale spin detection and electron paramagnetic resonance (EPR) spectrum of copper (Cu$2+$) 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 $sim 2-3$ MHz from copper-chloride molecules dissolved in poly-lysine.
• Score: 5.314490133647142
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report the nanoscale spin detection and electron paramagnetic resonance (EPR) spectrum of copper (Cu$^{2+}$) 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 $\sim 2-3$ MHz from copper-chloride molecules dissolved in poly-lysine. We also observe coherent Rabi oscillations and hyperfine splitting from single Cu$^{2+}$ 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 $\sim (250 \text{nm})^3$. This work will open the door for copper-labeled EPR measurements under ambient conditions in bio-molecules and nano-materials.

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