Electron-electron double resonance detected NMR spectroscopy using ensemble NV centers at 230 GHz and 8.3 Tesla

TL;DR

This paper demonstrates high-field NV-center-based NMR spectroscopy at 8.3 Tesla, including the first electron-electron double resonance detection of nuclear spins, enhancing spectral resolution for nanoscale chemical analysis.

Contribution

The study introduces a novel high-field NV-detected NMR technique using ODMR at 230 GHz, including the first EDNMR measurement with NV centers at such fields.

Findings

Successful ODMR at 230 GHz and 8.3 T

First EDNMR detection using NV centers at high field

Nanoscale NMR of $^{13}C$ spins demonstrated

Abstract

The nitrogen-vacancy (NV) center has enabled widespread study of nanoscale nuclear magnetic resonance (NMR) spectroscopy at low magnetic fields. NMR spectroscopy at high magnetic fields significantly improves the technique's spectral resolution, enabling clear identification of closely related chemical species. However, NV-detected NMR is typically performed using AC sensing through electron spin echo envelope modulation (ESEEM), a hyperfine spectroscopic technique that is not feasible at high magnetic fields. Within this paper, we have explored an NV-detected NMR technique for applications of high field NMR. We have demonstrated optically detected magnetic resonance (ODMR) with the NV Larmor frequency of 230 GHz at 8.3 Tesla, corresponding to a proton NMR frequency of 350 MHz. We also demonstrated the first measurement of electron-electron double resonance detected NMR (EDNMR) using the NV center and successfully detected $^{13}C$ nuclear bath spins. The described technique is limited by the longitudinal relaxation time ($T_1$), not the transverse relaxation time ($T_2$). Future applications of the method to perform nanoscale NMR of external spins at 8.3 T and even higher magnetic fields are also discussed.