• Could be due to:
• Band Gap: If the Fermi energy lies within a band gap, it means there are no available electronic states at that energy level. This is common in insulators and semiconductors.
• Plot Range: Ensure that your plot range includes the Fermi energy. Sometimes, the Fermi level might be outside the plotted energy range.
• Plot Resolution: Check if the resolution of your plot is fine enough to capture the Fermi level. A higher resolution might be needed.
• Calculation Errors: Verify that the calculations were performed correctly and that the Fermi energy value is accurate.

THANK YOU SO MUCH Sarada K Gopinathan

Dear Smita Patir

Is you structure metal or semiconductor? If it is metal. It should be equal to VBM and CBM. If it is insulator or semiconductor, fermi level can be anywhere inside band gap. Using smearing for semiconductor and insulators also helps to find fermi level. In that case, you cannot see any band at this energy level. Because it is fermi energy level not eigenstates.

Jasurbek Gulomov

@Jasurbek Gulomov its a semiconductor. Thanks for the answer. Is there any script to find the band gap?