Nonlinear birefringence and time-resolved Kerr measurement of spin lifetimes in (110) GaAs/ Aly Ga1-y As quantum wells

P. S. Eldridge, P. G. Lagoudakis, M. Henini, R. T. Harley

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14 Citations (Scopus)

Abstract

We report a study of the nonlinear birefringence in undoped (110)-oriented GaAs/AlGaAs quantum wells using time-resolved pump-probe Kerr spectroscopy. Due to the optical anisotropy of the (110) quantum well plane, photoexcited carriers can give rise to a nonlinear birefringence and so cause probe polarization rotation independent of the pump polarization, i.e., independent of spin orientation. We develop a methodology for accurate determination of electron-spin lifetimes using the Kerr technique which takes account of this phenomenon and present room-temperature measurements of wavelength and power density dependence of the spin-relaxation rate.

Original languageEnglish
Article number033302
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number3
DOIs
Publication statusPublished - 7 Jan 2010
Externally publishedYes

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