[Wien] How to calculate optical absorption edge ?

[Masood Yousaf]

Dear wien2k users

Kindly suggest how to calculate optical absortion edge in wien2k ? How it differs from band gap of material ? I read that first critical point in imaginary part of the dielectric function represents optical absorption edge. But how to ensure that which is the first critical point. Kindly guide


Best wishes
Masood
Universiti Tecknologi Malaysia
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