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[Scissors operator] This parameter effectively describes the difference between the theoretical and experimental band gap values. When the experimental value is known, you can perform a band structure calculation to find the theoretical band gap. Then simply set the scissors operator to the difference between the two values.

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[Tip] When there is no experimental band gap value but there are data on the dielectric function, you can repeat the calculations with varying scissors operator values and select the one that gives a theoretical absorption edge which matches the experimental value.

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In the absence of any experimental data, use a fixed proportion of the theoretical band gap as the scissors operator, for example 25%. This approach allows you to study trends in optical properties across a family of similar compounds.

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