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Microscopic understanding of relaxation under optical spin polarization in diamond defects

Develop a microscopic description of relaxation processes in diamond defects under optical spin polarization that can underpin a rigorous master‑equation derivation of the Bloch‑type dynamics used in the doubly driven spin–cavity system, since the relaxation dynamics under optical spin polarization are not well understood even without longitudinal modulation.

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Background

The paper employs phenomenological Bloch equations with ad hoc dissipation to analyze sideband spectroscopy under crossed transverse and longitudinal drives. For certain phenomena (e.g., time‑dependent equilibrium polarization), the authors note that a microscopic derivation would require a more complete understanding of relaxation mechanisms under optical spin polarization.

They suggest that a systematic treatment via a Lindblad or non‑Markovian master equation could uncover novel details, but that this effort depends on clarifying the relaxation pathways in diamond defects subjected to optical spin polarization.

References

This is in part because we do not understand well the relaxation processes in diamond defects with the OISP technique even in the absence of the longitudinal field.

— Sideband Spectroscopy in the Strong Driving Regime: Volcano Transparency and Sideband Anomaly (2508.14781 - Antonic et al., 20 Aug 2025) in Appendix: “Volcano transparency in P1 centers” — subsection “Oscillating equilibrium”