TY - JOUR
T1 - Many-electron excitons and Fermi-edge singularities in wide, parabolic (Al,Ga)As quantum wells
AU - Fritze, M.
AU - Chen, W.
AU - Nurmikko, A. V.
AU - Jo, J.
AU - Santos, M.
AU - Shayegan, M.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1992
Y1 - 1992
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.45.8408
DO - 10.1103/PhysRevB.45.8408
M3 - Article
AN - SCOPUS:0000553711
VL - 45
SP - 8408
EP - 8412
JO - Physical Review B
JF - Physical Review B
SN - 0163-1829
IS - 15
ER -