On the excited and metastable states of cr-related double centres in gaas

K. Kikoin

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4 Scopus citations

Abstract

The energy levels of a Cr-related trigonal centre in GaAs are studied both experimentally and theoretically. New lines and absorption bands in the energy interval of 0.9 < hv < 1.4 eV are discovered in the p-type GaAs:Cr by the method of light-induced modulation of absorption. These lines are ascribed to the intra-centre transitions with charge transfer at a [Cr-X] trigonal defect, [Cr-X-] —->[Cr°X°], where [Cr°X0) are metastable vibronic states with a large relaxation time which is found to be 10-1 s at room temperature. The microscopic theory of such a double defect is developed with the assumption that X is the arsenic vacancy and the strong lattice relaxation is originated from the pseudo-JahnTeller effect due to the tunnelling of an electron between CrGa- and VAs-related deep levels of the double-well effective potential.

Original languageEnglish
Pages (from-to)4561-4578
Number of pages18
JournalJournal of Physics C: Solid State Physics
Volume19
Issue number23
DOIs
StatePublished - 20 Aug 1986
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering (all)
  • Physics and Astronomy (all)

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