<div>Dear all users,</div> <div> I calculated the energy band with EV-GGA and PBE-GGA. The system is semiconductor.And the gap I calculated with the experimental structure is about 0.1ev with EV-GGA.But when I calculate with the optimized structure,the gap is disappear.From the band structure,it appears metallic.The band from EV-GGA and PBE-GGA seems very similar.The parameters in the calculation with experimental structure is the same as that with optimized structure.I think the optimized structure is OK. I am puzzled with that.</div> <div> Does anyone know it? Look forward to your advice. Any help will be appreciated.Thank you in advance.</div> <div> </div>
<div> Mary White</div><p> 
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