As far as I know, there are two methods of GW calculations in VASP.
1. VASP itself provides a way to do GW calculations. We can do it easily by modifying INCAR, the tutorial is shown below.
2. The second way need to be assisted by wannier90 code. Although this method is more comlicated, but the results are usually more clean. VASP also has such an example of silicon (please see the attached link)
Whenever you have a question about VASP, I think you'd better refere to its official manual first, and then post the question here if you still cannot get an anser there.
http://cms.mpi.univie.ac.at/vasp/vasp/Recipe_GW_calculations.html
http://cms.mpi.univie.ac.at/wiki/index.php/Bandstructure_of_Si_in_GW_%28VASP2WANNIER90%29
I had referred to the manual ,but was unable to get desired result . I am a little bit confused about the ground state DFT calculation ,so are we doing the optimisation of the structure using GW potential first and then the other two steps as suggested in Recipe for GW calculation, if you could help Sir Yue-Wen Fang.
It is not easy for me to answer your questions if I don't know the details of your problems. Anyway when you have a problem of general DFT, you'd better know what you are doing, and know why your system/property cannot be described by general DFT.
To evaluate band structure , you must include the following tag
LWANNIER = .TRUE. during GW calculation. Moreover, there should be a file naming wannier90.win in your current directory.
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