Anomalous Photoluminescence of Weakly Confined Excitons including Radiative Correction in Nano-to-Bulk Crossover Regime

6th International Conference on Optical, Optoelectronic and Photonic Materials and Applications 2014

Matsuda, Takuya^1 ; Yokoshi, Nobuhiko^1 ; Ishihara, Hajime^1

Department of Physics and Electronics, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka

599-8531, Japan^1

关键词: Center of mass;    Confined excitons;    Crossover regime;    Exciton state;    Nonlocalities;    Optical response;    Photoluminescence spectrum;    Radiative corrections;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/619/1/012012/pdf
DOI  :  10.1088/1742-6596/619/1/012012

来源: IOP

【 摘 要 】

We develop a theoretical formalism to calculate photoluminescence (PL) spectrum of weakly confined excitons incorporating the microscopic nonlocal optical response. The nonlocality is caused by the center-of-mass (c. m.) motion of exciton and becomes remarkable in nano-to-bulk crossover regime. The theory successfully explains the characteristics of recently observed peculiar PL spectra in high quality CuCl films [5], wherein the signals appear at the exciton states with the very large radiative corrections not only for the lowest level but also for the higher ones including non-dipole types of excitons.