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26 April 2024

» arxiv » cond-mat/0111593

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Optical Method for Determination of Carrier Density in Modulation Doped Quantum Wells
G.V.Astakhov ; V.P.Kochereshko ; D.R.Yakovlev ; W.Ossau ; J.Nurnberger ; W.Faschinger ; G.Landwehr ; T.Wojtowicz ; G.Karczewski ; J.Kossut ;
Date:	30 Nov 2001
Journal:	Phys. Rev. B, 65 (2002) 115310
Subject:	Strongly Correlated Electrons \| cond-mat.str-el
Abstract:	An optical method is suggested to determine the concentration of two-dimensional electrons in modulation-doped quantum wells at low and moderate electron densities between 10^{9} and 2x10^{11} cm^{-2}. The method is based on an analysis of magneto-reflectivity spectra of charged excitons (trions). The circular polarization degree and the oscillator strength of the charged excitons contain information about the density and spin polarization of two-dimensional electron gas. The method is applied to CdTe/(Cd,Mg)Te and ZnSe/Zn,Mg)(S,Se) heterostructures.
Source:	arXiv, cond-mat/0111593
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