QED of excitons with nonlocal susceptibility in arbitrary-structured dielectrics

TL;DR

This paper develops a comprehensive quantum theory for excitons with nonlocal susceptibility in complex dielectrics, enabling accurate calculations for nano-to-macro scale structures with weak exciton confinement.

Contribution

It introduces a practical quantum framework for excitons with nonlocal effects in arbitrary-structured dielectrics, bridging microscopic theories and QED approaches.

Findings

Good correspondence with microscopic nonlocal theory

Effective for dispersive and absorptive materials

Applicable to arbitrary-structured nano-to-macro dielectrics

Abstract

We have constructed a complete quantum theory for an optical process of excitons with nonlocal susceptibility originating from their center-of-mass motion. This theory provides a practical calculation method for arbitrary-structured nano-to-macro scale dielectrics where excitons are weakly confined. We obtain good correspondences with underlying theories, semiclassical microscopic nonlocal theory, and QED theories for dispersive and absorptive materials with local susceptibility.