I don't understand why Raman activity in this case is zero. In practical, metallic system also provide Raman peak (ex. Carbon nannotube). I try to calculate graphene (no gap) and I get the proper result. Can you give some more explanation or suggest me some reference about this topic?
I appreciate to your instructions. >So, the the Raman activity should be > zero ... >SB On Jun 15, 2010, at 3:50 AM, loc duong ding > wrote: > I calculate zigag nano ribbon with hydrogen terminated at the > edge. I checked DOS that showed no gap. > >> yes - SB > > > On Jun 14, 2010, at >>> 11:03 AM, loc duong ding > wrote: > >>> what's the gap of the >> unperturbed > >>> system? >>> SB >> >> Actually, > this >> is the firs time I calculate the Raman spectrum. I don't clear > about the gap of >> the unperturbed system? It means the electronic > band gap? ----------------------------------------------- Loc Duong Dinh Ms-Ph.D Student Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon, 440-746, Korea Email: mambom1902 at yahoo.com, ddloc at skku.edu