Optical absorption in single-crystal metastable (GaAs)1-x(Ge2)x alloys: Evidence for a Zinc-blende-diamond order-disorder transition

Kathie E. Newman*, A. Lastras-Martinez, Barnett Kramer, S. A. Barnett, M. A. Ray, John D. Dow, J. E. Greene, P. M. Raccah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

Single-crystal metastable (GaAs)1-x(Ge2)x alloys with 0<x<1 have been grown on (100) GaAs substrates by use of ultrahigh-vacuum ion-beam sputter deposition. Optical-absorption measurements showed that the direct gap E0 exhibited a large negative V-shaped bowing as a function of x with a minimum E0 0.5 eV near x=0.3. A zinc-blende to diamond-lattice order-disorder transition model is proposed as a possible explanation for these results.

Original languageEnglish (US)
Pages (from-to)1466-1469
Number of pages4
JournalPhysical review letters
Volume50
Issue number19
DOIs
StatePublished - 1983

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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