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Model dielectric functions for alloys of arbitrary compositions
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Image of FIG. 1.
FIG. 1.

Real (a) and imaginary (b) parts of of at room temperature for , 0.099, 0.198, 0.315, 0.419, 0.491, 0.590, 0.700, 0.804, and 1.00. Data are from Ref. 2, except those for are from Ref. 9. Successive spectra are offset by 3 in (a) and (b).

Image of FIG. 2.
FIG. 2.

Dielectric function of from the model of Ref. 5. The unphysical oscillators are indicated by the arrows.

Image of FIG. 3.
FIG. 3.

Schematic of a single CP structure in the PM.

Image of FIG. 4.
FIG. 4.

Dielectric function of together with the PM reconstruction from which the CP parameters were extracted.

Image of FIG. 5.
FIG. 5.

Amplitudes (a) and linewidths (b) of , , , and as a function of . The dots are the parameters and the solid lines are the cubic fits.

Image of FIG. 6.
FIG. 6.

As Fig. 5, for the energies of the CP. The triangles and solid curve are from the current work, and the circles and dashed curve are from Ref. 2.

Image of FIG. 7.
FIG. 7.

Comparison of data (open circles) with spectra (solid lines) reconstructed from the parameters of Table III for .

Image of FIG. 8.
FIG. 8.

A model QW structure without (a) and with (b) thick interface layers.

Image of FIG. 9.
FIG. 9.

spectra of a QW structure calculated, assuming an alloy interface (solid line), a physically mixed interface (EMA, dots), and no interface (dashed line). The overall thickness is the same in all cases.


Generic image for table
Table I.

PM parameters for . Entries marked with an asterisk are taken to be independent of and do not appear in Table II.

Generic image for table
Table II.

Compositionally dependent PM parameters for the alloys for which data are available.

Generic image for table
Table III.

Compositional dependence of the parameters in Table II as approximated by the cubic .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Model dielectric functions for AlxGa1−xAs alloys of arbitrary compositions