Abstract

Recently, intersubband relaxation in modulation doped GaAs/Al_xGa_1−xAs multiple quantum well structures (MDMQWS) has been observed directly by an infrared bleaching technique [1,2]. The intersubband time constants determined experimentally are surprisingly long (≈ 10 ps). But, as well width increases, electron lifetimes decrease. A well width change from 47 Å to 59 Å results in approximately a factor of two decrease in relaxation time.

© 1989 Optical Society of America