Nonlinear dynamics of the exciton reflection spectrum

18th International Conference PhysicA.SPb

Belyaev, L.Yu.^1 ; Kapitonov, Yu.V.^1 ; Stroganov, B.V.^1 ; Efimov, Yu.P.^1 ; Dolgikh, Yu.K.^1 ; Eliseev, S.A.^1 ; Petrov, V.V.^1 ; Ovsyankin, V.V.^1

St. Petersburg State University, 7/9 Universitetskaya nab., St.-Petersburg

199034, Russia^1

关键词: Charged carriers;    Decay components;    Excitonic resonance;    Oscillator strengths;    Pump-probe spectroscopy;    Reflection spectra;    Slow component;    Time dependency;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/769/1/012041/pdf
DOI  :  10.1088/1742-6596/769/1/012041

来源: IOP

【 摘 要 】

Nonlinear dynamics of refelction from InGaAs/GaAs quantum well was studied by pump-probe spectroscopy. Brewster geometry allowed to extract the time dependency of radiative width and nonradiative broadening of the excitonic resonance from reflection spectra. Pump pulse action leads to the increase of the nonradiative broadening and decrase of the radiative width. Fast decay component of the additional nonradiative broadening is attributed to the scattering on the pump-induced excitons. Slow component was explained by a scattering either on pump-induced charged carriers, or subsequently formed trions. This assumtion is additionaly proved by the decrase of the radiative width with same decay times caused by the redistribution of oscillator strength between exciton and trion states.