Nuclear Magnetic Resonance of Nano-scale Quantum Materials detected by Nitrogen Vacancy Ensembles in Diamond*

Nitrogen-Vacancy defect centers (NV) in diamond extend many of the analytical strengths of nuclear magnetic resonance (NMR) to nano- and microscale systems. NV magnetometry could provide new insights into nano-scale electronic states in quantum materials, such as low dimensional superconductors, semiconductors, 2D Van Der Waals materials. However, each material provide unique challenges for integration and measurement with NV diamonds. Here, we present sensitivity optimization for near surface NV ensembles and considerations for target nuclear isotopes. We characterize impact of layer thickness and depth of the NV layer on NV NMR. We also perform calculations and experiments to determine the impact of metal-insulator interfaces on the NV Centers and their magnetic sensitivity. Finally, we present results on the detection of NMR standards and methodology to integrate novel materials with NV ensemble implanted diamond to provide the optimal SNR for NV detected NMR.