We present a study of spin relaxation of excitons in a set of nominally undoped GaAs/AlGaAs quantum well (QW) structures by using time-resolved photoluminescence techniques. The initial polarization and the spin relaxation time have been measured varying the excitation energy between the heavy- and light-hole exciton of each well, at a temperature of 4 K. Typical spin relaxation times in the 50-120 ps range are found when increasing the well width from 25 to 90 Å; however no dependence of the spin relaxation time on the excitation wavelength has been observed.
TIME-RESOLVED SPIN-POLARIZATION SPECTROSCOPY IN GAAS/ALGAAS QUANTUM-WELLS / P.ROUSSIGNOL;P.ROLLAND;R. FERREIRA;C.DELALANDE;G. BASTARD;A.VINATTIERI; L. CARRARESI;M. COLOCCI;B. ETIENNE. - In: SURFACE SCIENCE. - ISSN 0039-6028. - STAMPA. - 267:(1992), pp. 360-364.
TIME-RESOLVED SPIN-POLARIZATION SPECTROSCOPY IN GAAS/ALGAAS QUANTUM-WELLS
VINATTIERI, ANNA;CARRARESI, LUCA;COLOCCI, MARCELLO;
1992
Abstract
We present a study of spin relaxation of excitons in a set of nominally undoped GaAs/AlGaAs quantum well (QW) structures by using time-resolved photoluminescence techniques. The initial polarization and the spin relaxation time have been measured varying the excitation energy between the heavy- and light-hole exciton of each well, at a temperature of 4 K. Typical spin relaxation times in the 50-120 ps range are found when increasing the well width from 25 to 90 Å; however no dependence of the spin relaxation time on the excitation wavelength has been observed.
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