High Resolution Temperature-Resolved Spectroscopy of the Nitrogen Vacancy $^{1}E$ Singlet State Ionization Energy

• URL: http://arxiv.org/abs/2507.10291v1
• Date: Mon, 14 Jul 2025 13:57:37 GMT
• Title: High Resolution Temperature-Resolved Spectroscopy of the Nitrogen Vacancy $^{1}E$ Singlet State Ionization Energy
• Authors: Kristine V. Ung, Connor A. Roncaioli, Ronald L. Walsworth, Sean M. Blakley,
• Abstract summary: Diamond nitrogen-vacancy ($mathrmNV-$) center plays a central role in many cutting edge quantum sensing applications.<n>Ionic energy of the $mathrm1E$ singlet state in the $mathrmNV-$ has only recently been measured at between 2.25 eV and 2.33 eV.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The negatively charged diamond nitrogen-vacancy ($\mathrm{{NV}^-}$) center plays a central role in many cutting edge quantum sensing applications; despite this, much is still unknown about the energy levels in this system. The ionization energy of the $\mathrm{^{1}E}$ singlet state in the $\mathrm{{NV}^-}$ has only recently been measured at between 2.25 eV and 2.33 eV. In this work, we further refine this energy by measuring the $\mathrm{^{1}E}$ energy as a function of laser wavelength and diamond temperature via magnetically mediated spin-selective photoluminescence (PL) quenching; this PL quenching indicating at what wavelength ionization induces population transfer from the $\mathrm{^{1}E}$ into the neutral $\mathrm{{NV}^0}$ charge configuration. Measurements are performed for excitation wavelengths between 450 nm and 470 nm and between 540 nm and 566 nm in increments of 2 nm, and for temperatures ranging from about 50 K to 150 K in 5 K increments. We determine the $\mathrm{^{1}E}$ ionization energy to be between 2.29 and 2.33 eV, which provides about a two-fold reduction in uncertainty of this quantity. Distribution level: A. Approved for public release; distribution unlimited.

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