Nonparabolic tendency of electron effective mass estimated by confined states in In0.53Ga0.47As/In(0.52)Al(0.48)AS multi-quantum-well structures

We observed that a series of peaks, which were clearly extracted from a pho tocurrent difference spectrum, corresponded to interband optical transition s of an In0.53Ga0.47As/In0.52Al0.48As multi-quantum wells structure. The no nparabolic tendency of the electron effective mass was suggested from eigen energies of conduction subbands, The effective mass estimated in a directio n normal to the InGaAs quantum well plane was heavier than the effective ma ss of the bulk band edge and was 0.07m(0) at the top of a quantum potential well. (C) 1999 Academic Press.