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Magneto‐optical spectroscopy of gated p‐doped CdMnTe quantum wells

We describe the magneto‐photoluminescence of (Cd,Mn)Te/(Cd,Zn,Mg)Te quantum wells containing a 2D hole gas . The hole population can be tuned either optically in p‐i‐p structures, by above barrier illumination, or electrically by applying a bias voltage of a few volts on a p‐i‐n structure. We identify the photoluminescence at low field as due to the positively charged exciton X+, which is destabilized at a given value of the Zeeman splitting, due to its crossing with a state involving a triplet configuration of the trion hole pair. The X+ looses its intensity in favor of a double line which exhibits features associated to band‐to‐band transitions at k = 0 and k = kF (wave vector at Fermi energy). (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)