How can i get correct band gap from the band structure?

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Md. Zahidur Rahaman

The energy gap between valence band and conduction band at R point is the possible band gap of the material.

Rahal Wassila Leila

@ Nurul Islam

Between the maximum of the valence Band, and the minimum of the conduction band. The direct band gap energy is on the R point. Good continuation.

Mohammad Pouya Ghaziani

You should take the difference between minimum conduction band and maximum valance band.