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PreprintCC BY 4.0arXiv

Quartet state of the neutral nitrogen-vacancy center in diamond and optimized spin readout under near-infrared two-photon excitation

  • Nikoletta Jegenyes
  • Pál Maák
  • Vladimir Verkhovlyuk
  • László Himics
  • Tamás Váczi
  • Miklós Veres
  • Ádám Gali
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Abstract

Photoionization of the excited nitrogen-vacancy center (NV-) in diamond leaves the neutral defect in a metastable quartet state of unknown energy. Using two-photon optically detected magnetic resonance with a tunable femtosecond laser, we resolve its onset in the spin contrast at 1.23 +/- 0.02 eV and, with the ground-state threshold from the same setup, place the quartet 0.54 +/- 0.04 eV above the neutral ground state. The threshold sets the optimum excitation for spin readout at 1060-1075 nm, in the near-infrared tissue window, with 26-37% higher shot-noise-limited sensitivity than at 1030-1040 nm.

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Cite

BibTeXRIS
BibTeX
@misc{jegenyes2026quartet,
  title = {{Quartet state of the neutral nitrogen-vacancy center in diamond and optimized spin readout under near-infrared two-photon excitation}},
  author = {Nikoletta Jegenyes and Pál Maák and Vladimir Verkhovlyuk and László Himics and Tamás Váczi and Miklós Veres and Ádám Gali},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.03343},
  eprint = {2611.03343},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.03343},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Quartet state of the neutral nitrogen-vacancy center in diamond and optimized spin readout under near-infrared two-photon excitation
AU  - Nikoletta Jegenyes
AU  - Pál Maák
AU  - Vladimir Verkhovlyuk
AU  - László Himics
AU  - Tamás Váczi
AU  - Miklós Veres
AU  - Ádám Gali
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2611.03343
UR  - https://arxiv.org/abs/2611.03343
AB  - Photoionization of the excited nitrogen-vacancy center (NV-) in diamond leaves the neutral defect in a metastable quartet state of unknown energy. Using two-photon optically detected magnetic resonance with a tunable femtosecond laser, we resolve its onset in the spin contrast at 1.23 +/- 0.02 eV and, with the ground-state threshold from the same setup, place the quartet 0.54 +/- 0.04 eV above the neutral ground state. The threshold sets the optimum excitation for spin readout at 1060-1075 nm, in the near-infrared tissue window, with 26-37% higher shot-noise-limited sensitivity than at 1030-1040 nm.
ER  -