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TT: Fachverband Tiefe Temperaturen

TT 41: Spintronics / Quantum Information: Materials and Methods (jointly with HL)

TT 41.7: Vortrag

Mittwoch, 13. März 2013, 16:30–16:45, H2

Electron spin-flip Raman scattering in a CdTe/(Cd,Mg)Te quantum well — •Dion Braukmann¹, J. Debus¹, D. Dunker¹, V. F. Sapega², D. R. Yakovlev^1,2, G. Karczewski³, T. Wojtowicz³, J. Kossut³, and M. Bayer¹ — ¹Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany — ²Ioffe Physical-Technical Institute, Russian Academy of Science, 194021 St. Petersburg, Russia — ³Institute of Physics, Polish Academy of Sciences, 02668 Warsaw, Poland

The Raman scattering of the electron spin in a neutral exciton has been studied in a CdTe/(Cd,Mg)Te quantum well (QW). The mechanism of the electron spin-flip Raman scattering (SFRS) is experimentally evaluated from the circular polarization properties of the scattered light as well as dependence of the electron-SFRS line intensity on the magnetic field direction with respect to the QW growth axis. The spin-flip process is governed by acoustic phonon interaction and anisotropic electron-heavy-hole exchange interaction. The probability of the anisotropic exchange interaction depends on the g factors of the involved carriers. It shows a strong angular dependence due to the anisotropic heavy-hole g factor. Moreover, by application of above-barrier illumination in addition to the resonant excitation of the neutral QW excitons the intensity of the electron-SFRS line can be modulated significantly.