  Photoluminescence (PL) and highly circularly-polarized magneto-PL (up to 50%
at 6 T) from two-step bandgap InAs/InGaAs/InAlAs quantum wells (QWs) are
studied. Bright PL is observed up to room temperature, indicating a high
quantum efficiency of the radiative recombination in these QW. The sign of the
circular polarization indicates that it stems from the spin polarization of
heavy holes caused by the Zeeman effect. Although in magnetic field the PL line
are strongly circularly polarized, no energy shift between the
counter-polarized PL lines was observed. The results suggest that the electron
and the hole g-factor to be of the same sign and close magnitudes.
