Optical spectroscopy of the two-dimensional electron gas in GaxIn1-xAs/AlyIn1-yAs single quantum wells

Yong Hang Zhang, Klaus Ploog

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

We report the results of a detailed photoluminescence investigation on n-type modulation-doped GaxIn1-xAs/AlyIn1-yAs single quantum wells with intentional Be-acceptor doping in the central region of the well. Strong collective recombinations of electrons with different k states up to the Fermi wave vector in the two-dimensional electronic system and excess photogenerated holes bound to ionized Be acceptors are observed. At higher sample temperatures, the bound holes are thermalized and become free. The optical transitions are then k conserving. A similar effect has been observed when the excess photogenerated holes outnumber the doped acceptors under higher photoexcitation densities. The binding energy of the excess photogenerated holes on Be acceptors is determined to be 12 meV on the basis of temperature-dependent photoluminescence measurements.

Original languageEnglish (US)
Pages (from-to)14069-14075
Number of pages7
JournalPhysical Review B
Volume45
Issue number24
DOIs
StatePublished - Jan 1 1992
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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