Optical Method for Determination of Carrier Density in Modulation Doped Quantum Wells

Details Optical Method for Determination of Carrier Density in Modulation Doped Quantum Wells Optical Method for Determination of Carrier Density in Modulation Doped Quantum Wells

2001-11-30

arxiv.org/abs/cond-mat/0111593v1

Phys. Rev. B, 65 (2002) 115310

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.65.115310

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.

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