[Pw_forum] A little energy gap (~ 0.2 eV) for graphene

[Cao TF]

Dear Ren
  I use the rectangular cell because I want to simulate STM image of hydrogen clusters on graphene.  And  I want to compare the DOS of graphene with hydrogenated graphene. I set the magnetic moment to graphene  in order to separate the spin-up and spin-down DOS. 

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