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Optical absorption edge of GaS under hydrostatic pressure |
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| Authors: | M Mejatty A Segura R Le Toullec JM Besson A Chevy H Fair |
| Institution: | Laboratoire de Physique des Solides, associé au C.N.R.S. France;Laboratoire de Luminescence, Equipe Associée au C.N.R.S., Université Pierre et Marie Curie, 4, Place Jussieu, 75230 Paris-Cedex 05, France;D. Faraday Laboratory, 21 Albermarie St., London, England |
| Abstract: | The pressure variation of the optical edge of GaS has been measured. The direct exciton has been studied up to 6 kbar at 77 K and the indirect edge up to 40 kbar at 300 K. The exciton is shown to have a coefficient of ?2 ± 0.5 × 10?6eV/bar and the indirect edge of ?ll ± 1.5× 10?6eV/bar. A discussion of the values of the pressure coefficients for direct and indirect transitions in gallium chalcogenides is given. |
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