Fine structure and spin dynamics of excitons in the GaAsÕAlxGa1ÀxAs superlattices

I. Ya. Gerlovin, Yu. K. Dolgikh, S. A. Eliseev, V. V. Ovsyankin, Yu. P. E mov, V. V. Petrov, I. V. Ignatiev, I. E. Kozin, Y. Masumoto

Research output

Abstract

Picosecond kinetics of polarized resonant photoluminescence ~PL! of HH excitons in the GaAs/AlGaAs superlattices is studied in an external magnetic field. The measurements were made in real time using a streak camera. For the magnetic field aligned along the heterostructure growth direction, the resonant PL exhibits oscillations in the degree of linear polarization. The oscillations are ascribed to quantum beats between sublevels of the optically active excitonic doublet split by the magnetic field. For the magnetic field aligned along the plane of the layers, the resonant PL is found to exhibit oscillations in circular polarization. These oscillations are related to beats between states of the optically active and optically inactive excitonic doublets. Experimental dependence of the oscillation frequency on the magnetic field strength and orientation has allowed us to determine the hole and electron g factors and the electron-hole exchange energy. Dynamics of the degree of circular polarization of the PL in
Original languageUndefined
Pages (from-to)035317-1-10
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number3
Publication statusPublished - 2002
Externally publishedYes

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