Development and Applications of High-field NV-detected NMR-ESR Techniques

The nitrogen-vacancy (NV) center in diamond has enabled studies of nanoscale Nuclear magnetic resonance (NMR) and electron spin resonance (ESR) with high sensitivity in small sample volumes at low magnetic field [1]. While low field NV-detected NMR techniques are useful in many experiments, NV-NMR at high magnetic field (>1T) with finer resolution on chemical shifts and higher thermal polarization can be advantageous for applications including surface NMR study of heterogeneous catalysis, ensemble NMR of microfluidics, and condensed matter studies aimed at probing micro- and nano-scale features [2]. We have recently demonstrated NV-detected ¹³C NMR and ESR at 4.2T and 8.3T [2][3]. In addition, we have shown that dynamic nuclear polarization (DNP) profile at high field reveals spin clustering in diamond [4]. The result shows the importance of DNP analysis for the detection of spin clusters and a pathway for efficient DNP at high magnetic fields. In this presentation, we will discuss about the recent development of our high-field NV-detected NMR and EPR techniques and their applications. The high-field NV-NMR and -ESR is a powerful tool for the investigation of nanoscale spin environments such as spin concentration, spatial distribution, polarization, and dynamics, which are crucial in solid-state quantum sensing and quantum information applications.