Nanoscale spin detection of copper ions using double electron-electron resonance at room temperature
arXiv:2101.02650 · doi:10.1103/PhysRevB.104.224412
Abstract
We report the nanoscale spin detection and electron paramagnetic resonance (EPR) spectrum of copper (Cu) 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 MHz from copper-chloride molecules dissolved in poly-lysine. We also observe coherent Rabi oscillations and hyperfine splitting from single Cu 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 . This work will open the door for copper-labeled EPR measurements under ambient conditions in bio-molecules and nano-materials.
arXiv comment28 pages, 9 figures, revised ms
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