K. Tanaka et al., Nonparabolic conduction subbands in nanoscale InGaAs/InAlAs quantum wells with photocurrent and transmission spectroscopy, J KOR PHYS, 39(3), 2001, pp. 469-472
Optical interband transitions of modulation-doped In0.53Ga0.47As/In0.52Al0.
48As multi-quantum wells were clearly observed in the photocurrent and the
transmission spectra. The steps of the transitions coincided between the tw
o spectra. The effective masses of the conduction subbands were estimated i
n fitting the transition energies to an effective mass equation. The masses
agreed with the values determined on our previous work with undoped In0.53
Ga0.47As/In0.52Al0.48As multiquantum wells. The effective mass normal to th
e quantum well plane was more than 50% heavier than the bulk band-edge mass
of InGaAs.