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- W3154877400 abstract "We present ab-initio calculations of photoionization thresholds and cross sections of the negatively charged nitrogen-vacancy (NV) center in diamond from the ground $^{3}!A_2$ and the excited $^{3}!E$ states. We show that after the ionization from the $^{3}!E$ level the NV center transitions into the metastable $^{4}!A_2$ electronic state of the neutral defect. We reveal how spin polarization of $mathrm{NV}^{-}$ gives rise to spin polarization of the $^{4}!A_2$ state, providing an explanation of electron spin resonance experiments. We obtain smooth photoionization cross sections by employing dense $k$-point meshes for the Brillouin zone integration together with the band unfolding technique to rectify the distortions of the band structure induced by artificial periodicity of the supercell approach. Our calculations provide a comprehensive picture of photoionization mechanisms of $mathrm{NV}^{-}$. They will be useful in interpreting and designing experiments on charge-state dynamics at NV centers. In particular, we offer a consistent explanation of recent results of spin-to-charge conversion of NV centers." @default.
- W3154877400 created "2021-04-26" @default.
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- W3154877400 date "2021-12-06" @default.
- W3154877400 modified "2023-09-25" @default.
- W3154877400 title "Photoionization of negatively charged NV centers in diamond: Theory and <i>ab initio</i> calculations" @default.
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- W3154877400 doi "https://doi.org/10.1103/physrevb.104.235301" @default.
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