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Linearly Polarized Emission of Quantum Wells Subject to an In-Plane Magnetic Field
D. Wolverson,Yu. G. Kusrayev,A. V. Koudinov,N. S. Averkiev,J. J. Davies,J. Kossut,G. Karczewski,T. Wojtowicz 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We present results on the linear polarization of the photoluminescence (PL) of dilute magnetic semiconductor quantum wells which is induced by an applied magnetic field. The PL is found to be partially linearly polarized, but without any correlation with the polarization of the exciting light, whilst the direction of the polarization does not depend on the direction of the magnetic field in the plane although its magnitude does. We present a model for this behavior in terms of a possible reduction of the in-plane symmetry of the quantum well; we conclude that any perturbations giving (i) a finite in-plane hole g-factor and (ii) a mixing of light and heavy holes are sufficient to generate the type of experimental behavior we observe.
Modulation of Quantum Well Optical Properties by Illumination above the Barrier Bandgap
D. Wolverson,A. V. Koudinov,Yu. G. Kusrayev,L. C. Smith,J. J. Davies,M. Wiater,G. Karczewski,T. Wojtowicz 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
The spin flip Raman scattering signals associated with the Mn2+ 3d5 electrons in a range of CdTe-based dilute magnetic semiconductor quantum well structures is shown to be sensitive to even very weak above-barrier illumination, as are the quantum-well photoluminescence from exciton and trion recombination and acoustic phonon Raman scattering signals excited in resonance with the quantum well. This surprising degree of sensitivity is discussed in terms of the modulation of the carrier densities in the quantum wells, leading to a modulation of the resonant intermediate state for Raman scattering and, therefore, of the scattering cross section. Depending on the majority intrinsic carrier type in the quantum wells, we show that either enhancing or quenching of the Raman signals can result.