[Wien] band structure of Ge in the zinc blende structure

[zoulikha charifi]

Dear Wien users   
I am studing the electronic properties of the Ge   
compound in the zinc blende phase. when I used the LDA
  
approximation, I obtained semimetal material. then I  

used different GGA methods but I get a direct band gap
  
between Gama-Gama with amount of zero or a smal   
quantity. There are some experimental data for this   
case show that this material has an indirect band gap 
 
which is Gama-L with value equal to 0.74 eV. Is there 
 
any body to help me for solving this problem.   
Thank you in advance,   
Yours   
Z. Charifi

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