AS i have seen in one reference that bandgap does not decrease with increase in width in case of zigzag graphene nanoribbon case while it happens in armchair case,why it happens so.
As you might know, pristine graphene (perfect structure) has a zero bandgap. Depending on how much the Width of GNR is increased, the bandgap should in principle change too even with a zigzag structure. For the armchair GNR, the structural tension could be reduced (or released) with the Width significantly increases, and the planar SP2 structure could be largely re-stored towards a structure of pristine graphene nanosheets. This is what I thought, although I am not an expert in the structures of graphene.
Thanks a lot Qijin Chi for your kind reply.I have calculated density of states,but need to calculate Transmission as a function of energy as well as applied voltage.Trasnmission function i have calculated as a function of energy ,but how voltage will be incorporated at particular energy,if you have any rough idea ,please throw some light .
regards
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