Quantum many-body effects in the optical response of ideal thin films

Abstract:We study quantum many-body effects in the long-wavelength optical response of confined electrons at finite temperatures. We simulate homogeneous electron gas confined in one dimension into a slab of nanoscale thickness. We demonstrate how the slab boundaries break down the ideal Drude response of free charge carriers, giving rise to scattering effects due to both the surfaces and quantum many-body interactions. We use a recent path-integral Monte Carlo (PIMC) approach developed in [Tiihonen et al. Phys. Rev. A 113, 053711] to quantify these effects in high accuracy. We perform phenomenological fits to Drude and Drude-Lorentz models parameters, manifesting various trends of the optical response with physical parameters like density and temperature, and numerical effects like finite size and the quantum statistics.

Optics (physics.optics); Computational Physics (physics.comp-ph); Quantum Physics (quant-ph)

arXiv:2608.28261 [physics.optics]

(or arXiv:2608.28261v1 [physics.optics] for this version)

https://doi.org/10.48550/arXiv.2608.28261 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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