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We developed a nanoscale zero-field electron spin resonance (ZF-ESR) spectroscopy method using a quantum sensor. This technique enhances sensitivity for studying electron interactions in various systems.

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Area of Science:

  • Physics
  • Chemistry
  • Biology
  • Quantum Sensing

Background:

  • Electron spin resonance (ESR) spectroscopy is widely used in science.
  • Zero-field ESR (ZF-ESR) offers unique insights into electron interactions but suffers from low sensitivity and large sample requirements.
  • Previous limitations hindered widespread adoption of ZF-ESR.

Purpose of the Study:

  • To develop a highly sensitive, nanoscale ZF-ESR spectroscopy method.
  • To overcome the sensitivity and sample size limitations of traditional ZF-ESR.
  • To enable practical applications of ZF-ESR in studying spin-modified systems.

Main Methods:

  • Utilized a nitrogen vacancy (NV) center in diamond as a highly sensitive quantum sensor.
  • Deployed the NV center to perform ZF-ESR spectroscopy at the nanoscale.
  • Measured the ZF-ESR spectrum of a small number of P1 centers in diamond.

Main Results:

  • Successfully demonstrated nanoscale ZF-ESR spectroscopy.
  • Obtained the ZF-ESR spectrum of few P1 centers in diamond.
  • Showed direct extraction of the hyperfine coupling constant from the measured spectrum.

Conclusions:

  • The developed method significantly enhances the sensitivity of ZF-ESR spectroscopy.
  • This technique allows for nanoscale investigation of electron fine and hyperfine interactions.
  • Opens new avenues for ZF-ESR applications in analyzing structure and polarity in organic and biological systems.