Photostimulated even acoustoelectric effect

The photostimulated photogalvanic (PG) and acoustogalvanic (AG) currents are calculated in a semiconductor placed in the field of two linearly polarized electromagnetic waves (with frequencies Ω1=2Ω2), acting on the scattering probability of electrons, and the field of a high-frequency sound flux. With the double laser illumination mentioned, the “electron gas → phonons” system becomes noncentrosymmetric, which leads to PG and AG effects. The latter represents a contribution to the acoustoelectric current linear in intensity and even in sound wave vector.