The pulse and monochromatic light stimulation of semiconductor quantum wells

TL;DR

This paper calculates light reflectance and absorbance in quantum wells with two close energy levels, considering arbitrary pulse shapes and damping, without assuming weak Coulomb interactions.

Contribution

It introduces a comprehensive model for quantum well optical responses that accounts for arbitrary pulse forms and strong Coulomb interactions, extending prior simplified approaches.

Findings

Reflectance and absorbance depend on pulse shape and damping parameters.

Two closely spaced energy levels can be modeled as magnetopolaron states.

The model does not rely on weak Coulomb interaction approximation.

Abstract

The light reflectance and absorbance are calculated for a quantum well (QW) the width of which is comparable with the light wave length. The difference of the refraction coefficients of the quantum well and barriers is taken into account. The stimulating pulse form is arbitrary. An existence of two closely situated discrete excitation energy levels is supposed. Such energy level pare may correspond to two magnetopolaron states in a quantizing magnetic field perpendicular to the QW plane. The relationship of the radiative and non-radiative damping is arbitrary. The final results does not use the approximation of the weak Coulomb interaction of electrons and holes.