Fermi-energy-edge singularity in quantum wells containing more than one occupied subband
- 15 March 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 43 (9) , 7354-7357
- https://doi.org/10.1103/physrevb.43.7354
Abstract
A study of the Fermi-energy-edge singularity in asymmetric modulation-doped quantum wells is reported. It is shown that high densities of free carriers in filled n=1 electron subbands have no significant influence on the edge singularity in partly occupied n=2 subbands, demonstrating the weakness of intersubband Coulomb-scattering processes. The enhancement of oscillator strength at the Fermi energy is of very similar magnitude to that for excitonic transitions in undoped quantum wells.Keywords
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