  We study the polariton relaxation dynamics for different scattering
mechanisms as: Phonon and electron scattering procesess. The relaxation
polariton is obtained at very short times by solving the Boltzman equation.
Instead of the well-known relaxation process by phonons, we show that the
bottleneck effect relaxes to the ground state more efficiently at low pump
power intensity when the electron relaxation process is included. In this way,
we clearly demonstrate that different relaxation times exist, for which any of
these two mechanism is more efficient to relax the polariton population to the
ground state.
