Oscillator Strengths for Neutral, Charged, and Scattered Excitons in CdTe Quantum Wells Containing a 2D Electron Gas

• Authors: R. Cox , V. Huard , C. Bourgognon , K. Saminadayar , S. Tatarenko , R. Miller
• Languages of publication: EN

Abstracts

EN

Absorption spectra have been measured for a 10 nm CdTe(0.3%Mn) quantum well with electron concentration n_e variable up to 1.5×10^{11}cm^{-2}. Following recent theory appropriate to low n_e, here ≈0.1/π a_B^2, the spectra are interpreted in a "strong exciton" model, where the initial oscillator strength of the excitonic resonance (X) is conserved, with screening and phase-space filling effects negligible. As n_e increases in zero-field and as the filling factorν increases in magnetic field, the intensity of X is transferred to: (i) trion processes, namely exciton-one electron scattering and the trion resonance (T), and (ii) quatron processes, namely exciton-two electron scattering and trion-one electron scattering. In magnetic field, the three- and four-body scattering processes become discrete, combined "exciton and cyclotron" and combined "trion and cyclotron" excitations that take all the intensity of X and T for ν≾1 and ν>2, respectively.

Keywords

EN

78.30.Fs; 78.67.De; 78.40.Fy; 78.55.Et

Discipline

• 78.55.Et: II-VI semiconductors
• 78.67.De: Quantum wells
• 78.40.Fy: Semiconductors
• 78.30.Fs: III-V and II-VI semiconductors

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 106
• Issue: 3
• Pages: 287-298

Dates

published

2004-09

received

2004-06-10

Contributors

author

R. Cox

• Equipe "Nanophysique et Semiconducteurs" de SP2M, CEA-Grenoble et du Laboratoire de Spectrométrie Physique, Université Joseph Fourier, 38054 Grenoble-Cedex, France

author

V. Huard

• Equipe "Nanophysique et Semiconducteurs" de SP2M, CEA-Grenoble et du Laboratoire de Spectrométrie Physique, Université Joseph Fourier, 38054 Grenoble-Cedex, France

author

C. Bourgognon

• Equipe "Nanophysique et Semiconducteurs" de SP2M, CEA-Grenoble et du Laboratoire de Spectrométrie Physique, Université Joseph Fourier, 38054 Grenoble-Cedex, France

author

K. Saminadayar

• Equipe "Nanophysique et Semiconducteurs" de SP2M, CEA-Grenoble et du Laboratoire de Spectrométrie Physique, Université Joseph Fourier, 38054 Grenoble-Cedex, France

author

S. Tatarenko

• Equipe "Nanophysique et Semiconducteurs" de SP2M, CEA-Grenoble et du Laboratoire de Spectrométrie Physique, Université Joseph Fourier, 38054 Grenoble-Cedex, France

author

R. Miller

• Department of Physics, La Trobe University, Victoria 3086, Australia

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Identifiers

DOI

10.12693/APhysPolA.106.287