Open AccessEffect of carrier recombination on time-resolved Faraday rotation spectroscopy in GaAs quantum wells
Author(s) -
Teng Li-Hua,
Xia Wang
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.057202
Subject(s) - faraday effect , faraday cage , spectral line , physics , spectroscopy , faraday rotator , rotation (mathematics) , relaxation (psychology) , magneto optic effect , quantum well , time evolution , exponent , condensed matter physics , atomic physics , magnetic field , materials science , optics , quantum mechanics , laser , psychology , social psychology , linguistics , philosophy , geometry , mathematics
Based on the rate equations of a two-level system, time-resolved Faraday rotation spectroscopy model was developed. It was found that the carrier recombination has strong effect on the decay of Faraday rotation signal. The model was also used to fit the Faraday rotation spectra measured in GaAs quantum wells. The electron spin relaxation time was obtained as 73.5 ps. However, the spin relaxation time was obtained only as 51.3 ps with the single exponent to fit the Faraday rotation spectra. Thus, the conventional method with the single exponent to fit the Faraday rotation spectra is inaccurate.