Dev, I believe that if you look closely at the published band structures of graphene you'll find that many graphs are <em>centered</em> on the K point. This doesn't mean that the K point is now the origin, it just means that the K point is the center of the published graph. That's because K is the interesting part of the band structure.
A quick Google (TM) of the web reveals more about graphene than I really wanted to know tonight. Here's a useful tutorial: http://www.ph.utexas.edu/~macdgrp/meetings/hongki-graphene(partial).pdf Note particularly the band structure on page 8, and compare it to the band structure on page 19. harman dev wrote: > Dear all, > > This is short extension with reference to my previous message. I > was wondering if this shift in the origin of the Brillouin Zone for > graphene is associated with the honeycomb symmetry. As mentioned, a > hcp cell such as that of Mg has the gamma point as the origin of its > Brillouin Zone whilst the point K seems to be the origin of the > Brillouin Zone for honeycomb lattices such as graphene and boron > nitride. Any comments on this would be great appreciated. Thank you. > > Cheers, > Dev > -- Mike Mehl Naval Research Laboratory Washington DC USA
