Collective Intersubband Excitations in Quantum Wells: Coulomb Interaction versus Subband Dispersion
1997; American Physical Society; Volume: 79; Issue: 23 Linguagem: Inglês
10.1103/physrevlett.79.4633
ISSN1092-0145
AutoresDmitri E. Nikonov, Ataç İmamoğlu, L. V. Butov, Holger Schmidt,
Tópico(s)Molecular Junctions and Nanostructures
ResumoThe dependence of the intersubband absorption line shape on the subband dispersion and the Coulomb interaction between electrons is studied using the Hartree-Fock semiconductor Bloch equations. For subbands with the same effective masses, we show that the absorption/emission line shape is solely determined by the single-electron properties. For very different effective masses, the Coulomb interaction results in a strong redistribution of the oscillator strength. The line shape in this limit is determined by a Fermi-edge collective mode induced by a repelling electron-hole pair.
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