Auteur(s): Ben Cheikh Z., Cronenberger S., Vladimirova M., Scalbert D.
, Boujdaria Kais, Baboux Florent, Perez Florent, Wojtowicz Thomas, Karzewski Gregorz
Conference: ICPS (Zurich, FR, 2012-07-29)
Actes de conférence: Proceedings of the 31st International Conference on the Physics of Semiconductors, vol. 1566 p.349 (2013)
Ref HAL: hal-00925573_v1
DOI: 10.1063/1.4848429
WoS: 000331793000174
Exporter : BibTex | endNote
Résumé:
We report on time-resolved Kerr rotation (TRKR) experiments done on n-doped CdMnTe quantum wells (QWs), in the regime where strong coupling between the electron and the Mn spin-flip excitations shows up. It has been proposed previously to deduce the 2D electron gas spin susceptibility from the coupling energy between these spin excitations. Here we measure the coupling energy on a high mobility sample down to very low excitation density, and compare the results with spin-flip Raman scattering (SFRS) on the same sample. The electron spin polarizations measured by TRKR and SFRS are found in relatively good agreement. However the spin susceptibility measured by TRKR exceeds systematically the values predicted by many-body theory. This could be an indication that the two-oscillator model used to describe mixed electron-Mn spin excitations needs to be improved.