OPTICALLY DETECTED ELECTROPHONON RESONANCE AND LINEWIDTHS IN TRIANGULAR QUANTUM WELLS

Tóm tắt

In  the  present  paper,  we  study  the  linear  optical  absorption  power in  triangular quantum  wells  subjected  to  a  laser  field  when  electrons  are  scattered  with  longitudinal optical phonons (LO phonons). The analytic expressions are obtained for optical absorption power  via  electron-LO  phonon  scattering.  The  linear  optically  detected  electron-phonon resonance (ODEPR) effect in a specific GaAs/AlAs quantum well with a triangular potential is  investigated.The  conditions  for  the  ODEPR  are  determined  on  the basis  of  theenergy conservation  law.  From  the  curves  expressing  the  dependence  of  the  absorption  power  on the photon  energy,we  find  the  ODEPR-linewidths  as the profiles  of  the  curves. The computational  results  show  that  the  ODEPR-linewidths  increase  with  temperature  and decrease with the electric field