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Magneto-optical Kerr effect spectroscopy based study of Lande g-factor for holes in GaAs/AlGaAs single quantum wells under low magnetic fields

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Title Magneto-optical Kerr effect spectroscopy based study of Lande g-factor for holes in GaAs/AlGaAs single quantum wells under low magnetic fields
 
Creator ARORA, A
MANDAL, A
CHAKRABARTI, S
GHOSH, S
 
Subject HEAVY-HOLE
EXCITONS
LIGHT
SEMICONDUCTORS
 
Description Results from a magneto-optical Kerr effect (MOKE) spectroscopy study of ground state heavy-hole and light-hole excitons in GaAs/Al0.3Ga0.7As single quantum wells, with widths ranging from 4.3 nm to 14nm, are presented. A novel setup and signal analysis procedure was adopted whereby polar MOKE measurements in magnetic fields up to 1.8 T could be performed with a conventional H-frame electromagnet. A first principles simulation based procedure used for simultaneously analyzing both the measured Kerr rotation and Kerr ellipticity spectral lineshapes is described in detail. The Zeeman splitting obtained from the above analysis helped to determine the longitudinal Lande g-factors. The hole g-factors were found to vary with well width, ranging from -0.6 to 1.1 for heavy-holes and 6.5 to 8.6 for light-holes. While the heavy-hole g-factor values are in fair agreement with values expected from k.p perturbation theory, no evidence is found to support theoretical predictions of possible well width dependent giant light-hole g-factors in GaAs/AlxGa1-xAs single quantum wells. (C) 2013 AIP Publishing LLC.
 
Publisher AMER INST PHYSICS
 
Date 2014-10-17T05:36:26Z
2014-10-17T05:36:26Z
2013
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 113(21)
http://dx.doi.org/10.1063/1.4808302
http://dspace.library.iitb.ac.in/jspui/handle/100/16083
 
Language en