Zeeman-gap anomaly in photoluminescence from a two-dimensional electron gas in CdTe/(Cd,Mg)Te quantum wells

We have investigated photoluminescence spectra from a two-dimensional elect ron gas in a n-type CdTe/Cd0.865Mg0.135Te Single quantum well in magnetic f ields up to 14 T at low temperatures. High-mobility two-dimensional carrier s in this system exhibited photoluminescence oscillation and splitting in a ccordance with the Landau filling factor. The pronounced spectral anomaly e specially near at odd filling factor suggests the importance of the spin de gree of freedom. The observed spectra exhibited the behavior predicted by a calculation by Hawrylak and Potemski [Phys. Rev. B 56, 12 386 (1997)] taki ng account of Anger and spin-flip recombination processes. Temperature as w ell as excitation power dependence of this anomalous photoluminescence peak s was investigated. [S0163-1829(99)05411-9].