Intersubband absorption in n‐type GaAs/AlGaAs (001) quantum wells: A tight‐binding study

We present theoretical calculations of the intersubband absorption in the conduction band of GaAs/AlGaAs (001) quantum wells (QWs), performed using the sp3d5s* empirical tight-binding model and a Green’s functions approach. The absorption spectra for both in-plane (TE) and perpendicular (TM) polarizations are calculated. The obtained TE/TM absorption ratio is in excellent agreement with recent experimental results. We find that the asymmetry of the QW potential has no significant effect on the TE/TM ratio. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)