[Wien] optical properties

[ben amara imen]

Hello
Im working on spinell compound . It has a half metallic behavior
When I have calculated its maginary functional dielectric for spin up (
here, the compound under study is a semiconductor ), this imaginary
compound is not equal to 0 for gap energy ( even for absorption) !!!!!
this can be correct !!!!!!????
can you help me nd tell me where is the problem .??
best regards
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