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arXiv · 2611.01326

Theoretical estimation of nonlinear response function and ultrafast optical spectroscopy of nitrogen vacancy centers

Arunangshu Debnath
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Abstract

The theoretical description of the ultrafast optical response of nitrogen-vacancy centers has traditionally been developed using the nonlinear response function formalism based on a displaced harmonic oscillator model. However, restrictive defect geometries that lead to rich phonon mode distributions can limit the validity of this model. Here, we extend this framework by incorporating state-dependent oscillator modes characterized by different frequencies. We demonstrate that, as a consequence, the nonlinear response function is modified by a straightforward correction term that can be evaluated using operator algebraic techniques. These modifications directly impact two-dimensional correlation spectroscopy, which serves as a vital characterization tool for color centers by resolving ultrafast correlated electron-vibrational dynamics.

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Arunangshu Debnath. 2026-10-31. Theoretical estimation of nonlinear response function and ultrafast optical spectroscopy of nitrogen vacancy centers. https://arxiv.org/abs/2611.01326

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