[Pw_forum] honeycomb lattices and shift in gamma point?
Michael Mehl
rcjhawk at gmail.com
Wed Nov 28 02:12:52 CET 2007
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
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