Coulomb effects on the gain spectrum of semiconductors

W. F. Brinkman, P. A. Lee

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


We have investigated the effect of Coulomb interactions on the gain spectra of highly excited semiconductors, specifically GaAs. It is shown that at low temperatures there is an enhancement of the direct excitation of approximately a factor of 2 and a sideband due to particle-hole pair excitations that extends into the gap. As the temperature increases, it is argued by analogy to the electron-phonon problem that the sideband changes into an Urbach tail with gain of the order of 10-100 cm-1.

Original languageEnglish (US)
Pages (from-to)237-240
Number of pages4
JournalPhysical review letters
Issue number4
StatePublished - 1973

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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