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Physical Review B

Quantum description of exciton-light coupled states for a thin film

Hiroshi Ajiki

Published Oct 29, 2015• 1 citation
Publisher

Abstract

The superposition coefficients of the coupled states of a photon and an exciton confined in a thin film are provided using Fano's method [U. Fano, Phys. Rev. 124, 1866 (1961)], in which the exciton interacts with continuum photon states. The coupled states are classified into leaky and surface modes, the latter of which are investigated with a focus on the dispersion relation, the exciton component, and their film-thickness dependence. The obtained coupled states enable us to study exciton-mediated optical properties that cannot be described by a semiclassical scheme, such as photoluminescence and the radiative decay of a biexciton. As applications of the coupled states, we calculate the population decay dynamics and photoluminescence spectra of an exciton in a thin film.

DOI
10.1103/physrevb.92.155316

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The superposition coefficients of the coupled states of a photon and an exciton confined in a thin film are provided using Fano's method [U. Fano, Phys. Rev. 124, 1866 (1961)], in which the exciton interacts with continuum photon states. The coupled states are classified into leaky and surface modes, the latter of which are investigated with a focus on the dispersion relation, the exciton component, and their film-thickness dependence. The obtained coupled states enable us to study exciton-mediated optical properties that cannot be described by a semiclassical scheme, such as photoluminescence and the radiative decay of a biexciton. As applications of the coupled states, we calculate the population decay dynamics and photoluminescence spectra of an exciton in a thin film.
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