Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 17: Spintronics II (joined session with TT)
HL 17.1: Talk
Monday, March 20, 2017, 14:45–15:00, POT 151
Observation of suppressed electron giant-Zeeman splitting in a (Cd,Mn)Te/(Cd,Mg)Te quantum well — •Janina J. Schindler1, Jörg Debus1, Victor F. Sapega2, Dmitri R. Yakovlev1,2, Grzegorz Karczewski3, Tomasz Wojtowicz3, and Manfred Bayer1,2 — 1Experimental Physics 2, TU Dortmund University, Dortmund, Germany — 2Ioffe Institute, Russian Academy of Sciences, St. Petersburg, Russia — 3Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
We have studied the electron spin properties in a (Cd,Mn)Te/(Cd,Mg)Te quantum well modulation-doped with a high-mobile, highly concentrated two-dimensional electron gas by means of resonant spin-flip Raman scattering (SFRS). Resonant SFRS is a spin manipulating optical tool that also provides insight in spin interaction processes and spin-level structures. Two electron-SFRS signals with sharp resonance profiles at about 1.594eV and 1.599eV are observed, both showing no exciton-exchange energy offset at 0 T. The Mn-ion interactions with carriers in diluted magnetic semiconductors (DMS) lead typically to the giant Zeeman splitting of the electron and hole spin states with effective g-factors in the range of 10 to 80. However, the electron-SFRS signals demonstrate an effective g-factor of -1.7, which is characteristic for non-magnetic II-VI quantum wells. The optical selection rules derived from the circular polarization features let us assume that the SFRS processes involve a negative trion with componensated electron spins or a highly localized exciton bound to an impurity in the (Cd,Mn)Te quantum well.