Abstract
A generalized Sellmeier model, also referred to as the Lorentz-Dirac model, has been used for the description of the dielectric function of a number of technologically important materials in the literature. This model represents the frequency-dependent dielectric function as a sum over Green functions of classical damped harmonic oscillators, much in analogy with the functional form used for the dynamic polarizability of an atom, but with one important addition, namely, a complex-valued oscillator strength in the numerator. Here, we show that this generalized functional form can be justified based on the response function of coupled damped oscillators. The encountered analogies suggest an explanation for the generally observed success of the Lorentz-Dirac model in describing the dielectric function of crystals of consummate technological significance.
Recommended Citation
T. Das et al., "Coupled Oscillators and Dielectric Function," Physical Review B, vol. 111, no. 11, article no. 115101, American Physical Society, Mar 2025.
The definitive version is available at https://doi.org/10.1103/PhysRevB.111.115101
Department(s)
Physics
International Standard Serial Number (ISSN)
2469-9969; 2469-9950
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2025 American Physical Society, All rights reserved.
Publication Date
15 Mar 2025
Comments
National Science Foundation, Grant PHY-2110294