FERMI-ENERGY-EDGE SINGULARITY IN QUANTUM-WELLS CONTAINING MORE THAN ONE OCCUPIED SUBBAND

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关键词: LUMINESCENCE SPECTRA;    OPTICAL-SPECTRA;    ABSORPTION;    PHOTOLUMINESCENCE;    HETEROSTRUCTURES;    CARRIER;   

DOI  :  10.1103/PhysRevB.43.7354

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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