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

Kai Zhang,Shreya Ghosh,S. Saxena,M. Dutt

Published 2021 in Physical review B

ABSTRACT

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.

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