Influence of phonon bottleneck on a quantum dot laser

Abstract

The electron–LO phonon interactions in a quantum dot are studied based upon the nonequilibrium Green's function method to discuss the laser properties of the dot at high temperature regime. The collisional effects due to the LO-phonon scattering are introduced into the transport equation through the spectral functions of carriers. It is found that significant improvement of laser characteristics is still expected in the quantum dot laser even if the phonon bottleneck problem exists. However, it is also shown that the size fluctuation of the dots must be suppressed within a few percent for the dot laser.