17 research outputs found
Electron Scattering and Hybrid Phonons in Low Dimensional Laser Structures made with GaAs/AlxGa1-xAs
We theoretically and numerically present the hybrid phonon modes for the
double heterostructure GaAs/AlxGa1-xAs and their interactions with electrons.
More specifically, we have calculated the electron capture within a symmetric
quantum well via the emission of hybrid phonons. Our investigation shows that
the capture rates via the hybrid phonons are matched to the rates predicted by
the dielectric continuum (DC) model and the concentration of aluminium which is
an important parameter for controlling the electron capture process in light
emitting diodes (LED).Comment: 11 page
Surface scattering velocities in III-nitride quantum well laser structures via the emission of hybrid phonons
We have theoretically and numerically studied nitride-based quantum well (QW)
laser structures. More specifically, we have used a QW made with III-nitride
where the width of the barrier region is large relative to the electron mean
free path, and we have calculated the electron surface capture velocities by
considering an electron flux which is captured into the well region. The
process is assisted by the emission of the longitudinal optical phonons as
predicted by the hybrid (HB) model. The results of surface capture velocities
via the emission of HB phonons are compared to the emission of the dielectric
continuum phonons (Zakhleniuk et al 1999 Phys. Status Solidi a 176 79). Our
investigation shows that the two different phonon models predict almost the
same results for the non-retarded limit. Furthermore, the surface capture
velocities strongly depend on the size of the structure and the heterostructure
materials. Lastly, a comparison to the recent experimental values shows that
our model could accurately describe the experimentally measured parameters of
the quantum capture processes