AlxGa1−xAs based parabolic quantum well structures: Enhancement of multisubband electron mobility

We analyse the effect of parabolic potential profile on the multrisubband electron mobility in a GaAs-AlGaAs parabolic double quantum well structure. We show that in case of a double quantum well structure, the mobility is enhanced at large well widths at which two subbands are occupied. On the other hand for a single parabolic quantum well, the occupation of the second subband occurs at a large well width compared to that of the single square well. The mobility enhances nonlinearly with increase in well width till the second subband is occupied.