Investigation of Near-Surface Defects of Nanodiamonds by High-Frequency EPR and DFT Calculation
arXiv:1906.08354 · doi:10.1063/1.5085351
Abstract
Nanodiamond (ND) hosting nitrogen-vacancy (NV) centers is a promising platform for quantum sensing applications. Sensitivity of the applications using NV centers in NDs is often limited due to presence of paramagnetic impurity contents near the ND surface. Here, we investigate near-surface paramagnetic impurities in NDs. Using high-frequency (HF) electron paramagnetic resonance spectroscopy, the near-surface paramagnetic impurity within the shell of NDs is probed and its g-value is determined to be 2.0028(3). Furthermore, HF electron-electron double resonance-detected nuclear magnetic resonance spectroscopy and a first principle calculation show that a possible structure of the near-surface impurity is the negatively charged vacancy V-. The identification of the near-surface impurity by the present investigation provides a promising pathway to improve the NV properties in NDs and the NV-based sensing techniques.
21 pages, 6 figures
References in corpus (9)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- Advanced capabilities for materials modelling with Quantum ESPRESSO
- High-sensitivity diamond magnetometer with nanoscale resolution
- High-fidelity projective readout of a solid-state spin quantum register
- Scanning magnetic field microscope with a diamond single-spin sensor
- Scalable quantum register based on coupled electron spins in a room temperature solid
- Nanoscale magnetic imaging of a single electron spin under ambient conditions
- Quenching Spin Decoherence in Diamond through Spin Bath Polarization
- A high-frequency electron paramagnetic resonance spectrometer for multi-dimensional, -frequency and -phase pulsed measurements