Many-electron excitons and Fermi-edge singularities in wide, parabolic (Al,Ga)As quantum wells

M. Fritze, W. Chen, A. V. Nurmikko, J. Jo, M. Santos, M. Shayegan

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Wide n-type parabolic (Al,Ga)As quantum wells have been studied by use of magneto-optical techniques. Striking spectral features, reflective of many-electron one-hole exciton effects, have been observed in these systems. These effects involve the Fermi-edge singularity phenomenon, now in a quasi-three-dimensional case. In this system, the closely spaced conduction subbands act as resonating channels for multiple electron-hole Coulomb scattering, allowing the singularity enhancement to influence the entire (shallow) Fermi sea. The photoluminescence spectra show pronounced enhancements at high energy (near EF) in addition to prominent subband exciton peaks despite the presence of an electron Fermi sea. Applied magnetic fields show subband depopulation effects as well as strong, periodic enhancements whenever the Fermi level is in near resonance with a higher subband.

Original languageEnglish (US)
Pages (from-to)8408-8412
Number of pages5
JournalPhysical Review B
Issue number15
StatePublished - 1992

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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