Emission of acoustic phonons due to spin-flip electron transitions in nonsymmetric quantum wells

We have considered the emission of nonequilibrium acoustic phonons in the process of spin-flip transitions of electrons in nonsymmetric quantum wells. The spin splitting of the electron energy spectra causes the modifications of the energy and angular distributions as functions of the transverse voltage. The spin-flip contribution to the emission rate is substantial for the phonons being emitted at considerable angles to the normal direction. The intensity of phonon emission for such angles increases several times for InAs-based quantum wells, due to the contribution of spin-flip transitions.