Line shapes of intersubband and excitonic recombination in quantum wells: Influence of final-state interaction, statistical broadening, and momentum conservation
作者： J. Christen , D. Bimberg
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摘要: A realistic and comprehensive theory of line shapes for spontaneous recombination two-dimensional carriers in quantum-well (QW) structures is developed. Starting from the shape intersubband recombination, which takes into account QW density states thermal carrier distribution function, impact momentum (non)conservation on luminescence considered. Then Lorentzian broadening due to finite lifetime final Gaussian statistical fluctuations eigenenergies characteristic, e.g., interface roughness incorporated. The effects Coulomb interaction charge at low densities are considered quantitatively, including both excitonic bound enhancement above band gap. For a case study, GaAs investigated. line-shape evaluation definitely proves that any temperature up 300 K contradiction previous assumptions some other authors. At temperatures all lines consist, first view, unresolved doublets very close energy. high-energy component identified as free-electron--heavy-hole exciton. Momentum not found does need be conserved free-exciton process temperatures. high temperatures, conservationmore » reestablished: conservation understood depend relative amplitude interface-roughness-induced lateral potential compared energy excitons.« less
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