Abstract
AbstractWe have constructed QED theory for excitons with microscopic nonlocality or nonlocal susceptibility originating from their center‐of‐mass motion. The nonlocality must be properly considered in excitons' weak (center‐of‐mass) confinement regime where the long wavelength approximation is breakdown. This theory keeps good correspondences with its underlying theories, the QED theory for dispersive and absorptive local dielectrics and the microscopic nonlocal theory developed in the semiclassical framework. Our theory provides correlation functions of excitons, which renormalize radiative shift, transition between exciton states via electromagnetic fields, radiative and nonradiative relaxation processes. By using these functions, we can systematically study various nonlinear, dephasing, and emission processes of excitons in weak‐confinement to bulk‐like systems
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