High-Resolution NMR Spectroscopy at Large Fields with Nitrogen Vacancy Centers.

Area of Science:

• Quantum sensing
• Nanoscale nuclear magnetic resonance (NMR)
• Solid-state physics

Background:

• Nitrogen-vacancy (NV) centers in diamond are sensitive quantum sensors.
• NV centers can detect nuclear magnetic resonance (NMR) signals from small samples at room temperature.
• High magnetic fields enhance NMR signals but pose challenges for NV-based detection.

Purpose of the Study:

• To develop a method for detecting NMR signals from micron-sized samples at high magnetic fields using NV centers.
• To overcome the technical difficulties of coupling NV-based sensors with high-frequency nuclear signals.
• To achieve high spectral resolution in nanoscale NMR sensing.

Main Methods:

• A novel method was developed to map energy shifts in induced nuclear spin signals.
• The nuclear spin signal is transferred to the NV sensor.
• The method incorporates free-precession periods for sample nuclear spins, decoupling them from the sensor.

Main Results:

• The developed method successfully detects NMR signals from micron-sized samples at high magnetic fields.
• High spectral resolution is achieved, limited primarily by nuclear spin coherence.
• The technique enables exploration of the high magnetic field regime for NV-based NMR.

Conclusions:

• This work presents a breakthrough in nanoscale NMR sensing using NV centers at high magnetic fields.
• The method offers a pathway to enhanced sensitivity and spectral resolution for studying small samples.
• This advancement opens new possibilities for chemical shift and J coupling analysis in micro- and nanoscale systems.