[Pw_forum] How to change the weight parameter in hybrid functional?

杨茂 vcuteym at 126.com
Wed Dec 10 18:27:55 CET 2008

Hi, everyone
The "PBE hybrid functional" is given as: 
Exc(PBE)=a*Ex(HF)+(1-a)*Ex(PBE)+Ec(PBE). There is a weight parameter "a" in the range (0,1), and PBE0 is for a=0.25. How can I change the parameter "a" in the input file of PWSCF code?
"Phys. Rev. Lett. 101, 106802 (2008)" and "Phys. Rev. Lett. 101, 046405 (2008)"
have changed parameter "a" in order to make the bandgap value of some semiconductors agreed with experiment.
Email: vcuteym at 126.com
School of Physics
Peking University
Beijing, 100871
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