Collective Recombination of Two-Dimensional Electron Gas with Bound Holes and Density Dependent Band-Gap Renormalization in Ga InAs/A1IAs Single Quantum Wells,
Abstract
Due to the k-conservation restriction the intrinsic luminescence from the two-dimensional electron gas (2DEG) in modulation-doped (MD) quantum wells (QWs) of high structural perfection consists of a sharp peak centered around the band gap instead of a step-like emission band extending up to the Fermi edge as expected. Therefore, in such QWs it is not possible to study the density of states as well as the optical processes involving electrons near the Fermi edge directly by means of photoluminescence (PL) experiments. In order to observe the luminescence involving all occupied electron states below the Fermi edge in the 2DEG, some mechanism has to be introduced to localize photogenerated holes and relax the k-conserving law. Alloy fluctuations may localize the holes in ternary MD QW, but the random character of this localization potential causes some difficulty for reproducible studies.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 22, 1992
- Accession Number
- ADP007843
Entities
People
- J. C. Maan
- K. Kern
- M. Potemski
- R. Cingolani
- Y. H. Zhang