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Exciton-Electron Interaction in Quantum Wells with a Two Dimensional Electron Gas of Low Density

Ossau W.¹, Yakovlev D.R.¹, Hu C.Y.¹, Kochereshko V.P.², Astakhov G.V.², Suris R.A.², Christianen P.C.M.³, Maan J.C.³

¹Physikalisches Institut der Universitat Wurzburg, Am Hubland, Wurzburg, Germany
²A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia Ioffe Institute, St. Petersburg, Russia

³Research Institute for Materials, High Field Magnet Laboratory, University of Nijmegen, ED Nijmegen, The Netherlands

Выставление онлайн: 19 апреля 1999 г.

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II-VI quantum well structures containing a 2DEG of low density have been investigated by means of polarized photoluminescence, photoluminescence excitation and reflectivity in external magnetic fields up to 20 T. The spin splittings of the excition X and the negatively charged exciton X^- are measured as a function of the magnetic field strength. The behavior of the magnetic-field-induced polarization degree of the luminescence line related to X^- demonstrates the formation process of negatively charged excitons from excitons and free carriers polarized by the external magnetic field. We have determined the binding energies of the trion formed either with the heavy-hole or the light-hole exciton. The optically detected magnetic resonance (ODMR) technique was for the first time applied to study the optical transition processes in a nanosecond timescale. The electron ODMR was observed with the detection on either the direct exciton or the negatively charged exciton X. Further evidence for the interaction of excitons with the electrons of the two dimensional gas are demonstrated by a combined exciton-cyclotron resonance line observed in reflectivity and luminescence excitation, shake-up processes observed in photoluminescence as well as inelastic and spin-dependent scattering processes.

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