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Deformation Potentials for Excitons in Cuprous Halides

1972; American Physical Society; Volume: 5; Issue: 8 Linguagem: Inglês

10.1103/physrevb.5.3189

0556-2805

J. B. Anthony, A. D. Brothers, D. W. Lynch,

Advanced Chemical Physics Studies

The hydrostatic-pressure shifts of the ${Z}_{1,2}$ and ${Z}_{3}$ exciton peaks were measured in thin films of cubic CuCl, CuBr, and CuI at 90 K. That of the ${E}_{1}$ peak in CuI also was measured. The deformation potentials of all $Z$ excitons and of the ${E}_{1}$ exciton in CuI, about -1 eV, are more than twice those of the $Z$ excitons in CuCl and CuBr. This suggests the two valence bands in CuI may be considerably more mixed than in CuCl and CuBr.