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arXiv · 1907.08156

Understanding the Linewidth of the ESR Spectrum Detected by a Single NV Center in Diamond

Benjamin Fortman·Susumu Takahashi
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Abstract

Spectral analysis of electron spin resonance (ESR) is a powerful technique for various investigations including characterization of spin systems, measurements of spin concentration, and probing spin dynamics. The nitrogen-vacancy (NV) center in diamond is a promising magnetic sensor enabling improvement of ESR sensitivity to the level of a single spin. Therefore, understanding the nature of NV-detected ESR (NV-ESR) spectrum is critical for applications to nanoscale ESR. Within this work we investigate the linewidth of NV-ESR from single substitutional nitrogen centers (called P1 centers). NV-ESR is detected by a double electron-electron resonance (DEER) technique. By studying the dependence of the DEER excitation bandwidth on NV-ESR linewidth, we find that the spectral resolution is improved significantly and eventually limited by inhomogeneous broadening of the detected P1 ESR. Moreover, we show that the NV-ESR linewidth can be as narrow as 0.3 MHz.

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Benjamin Fortman, Susumu Takahashi. 2019-07-18. Understanding the Linewidth of the ESR Spectrum Detected by a Single NV Center in Diamond. https://doi.org/10.1021/acs.jpca.9b02445

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