Multidimensional Spectroscopy of Nuclear Spin Clusters in Diamond

Area of Science:

• Solid-state physics
• Quantum sensing
• Spectroscopy

Background:

• Optically active spin defects in solids are valuable for sensitive nuclear spin cluster investigations.
• Near-surface defects are crucial for molecular structure analysis via nuclear magnetic resonance (NMR).
• Enhanced spectroscopic characterization is needed for precise nuclear environment mapping.

Purpose of the Study:

• To develop advanced Fourier spectroscopy techniques for improved localization and mapping of nuclear spin environments.
• To demonstrate the application of these techniques to shallow nitrogen-vacancy centers at room temperature.
• To enhance the use of spin defects for molecular structure analysis in chemical and biological contexts.

Main Methods:

• Utilized multidimensional spectroscopy, adapted from classical NMR.
• Employed weak measurements of single-nuclear-spin precession.
• Applied Fourier spectroscopy to ^{13}C nuclear spin environments of individual, shallow nitrogen-vacancy centers.

Main Results:

• Achieved improved nuclear spin localization by encoding hyperfine components along spectral dimensions.
• Demonstrated spectral editing of nuclear-spin pairs.
• Successfully measured internuclear coupling constants.

Conclusions:

• The developed Fourier spectroscopy techniques significantly improve the mapping of nuclear spin environments.
• These methods provide new tools for detailed spectroscopic analysis of molecular structures using single-spin probes.
• This research advances the application of quantum defects for high-resolution chemical and biological sensing.