POLARON EFFECTS ON THE OPTICAL RECTIFICATION IN ELECTRIC-FIELD-BIASEDPARABOLIC QUANTUM-WELLS

Second-order susceptibilities are calculated for weak-coupling optical polaron systems in the electric-field-biased parabolic quantum well s tructure. Most emphasis is devoted to the electron-LO-phonon interacti on. The origin of the large optical rectification lies in the possibil ity of tuning independently the parabolic potential shape (force const ant D in the potential is tunable) and the applied bias field F. The t heoretical value of the optical rectification in this structure is mor e than a factor of 10 higher than in the structure where the electron- LO-phonon interaction is ignored. It has been shown that our results a re independent of the electron-electron interaction and of the number of electrons in the parabolic quantum well.