2021/01/31 by Kai Zhang, Shreya Ghosh, Sunil Saxena +2 · 5 citations
Biochemistry, Genetics and Molecular Biology · Chemical Engineering · Chemistry · Materials Science · Physics and Astronomy · #Analytical Chemistry and Sensors #Atomic physics #Chemistry #Condensed matter physics #Copper #Diamond and Carbon-based Materials Research #Electron #Electron Spin Resonance Studies #Electron paramagnetic resonance #Hyperfine structure #Ion #Materials science #Molecular physics #Nuclear magnetic resonance #Paramagnetism #Physics #Pulsed EPR #Spin (aerodynamics) #Spin echo #Spins #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.104.224412
published in Physical review. B./Physical review. B 104(22) (American Physical Society) · 28 pages, 9 figures, revised ms
arxiv created 2021/08/31 · openalex publication_date 2021/12/08 · arxiv updated 2022/01/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report the nanoscale spin detection and electron paramagnetic resonance (EPR) spectrum of copper (Cu2+) ions via double electron-electron resonance (DEER) with single spins in diamond at room temperature and low magnetic fields. We measure unexpectedly narrow EPR resonances with linewidths \ensuremath∼2\ensuremath-3 MHz from copper-chloride molecules dissolved in polylysine. 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 \ensuremath∼(250\phantom\rule0.16em0exnm)3. This work will open the door for copper-labeled EPR measurements under ambient conditions in biomolecules and nanomaterials.