Re: 4fold symmetry of bands in 6fold symmetry structure...

"Steven G. Johnson" <[email protected]> Fri, 20 Aug 2010 17:50:57 -0400

Newsgroups	gmane.comp.science.photonic-bands
Message-ID	<[email protected]>

On Aug 20, 2010, at 8:05 AM, Joachim Kalden wrote:
> although i defined a hexagonal structure in epsilon, the bands have  
> rather 4fold symmetry (see attachments). I just don't get the clou!
>
> (set! geometry-lattice (make lattice (size 4 4 no-size)))

Your cell is square, not hexagonal.

See the triangular-lattice example in the MPB tutorial.

--SGJ