On Nov 6, 2008, at 11:48 AM, Maksim Miski-Oglu wrote: > I have a problem with calculation of the band structure of metallic > rods > arranged in a triangular lattice. I started with 2D problem with > rods of > dielectric material to compare it with the result of MPB > calculation. I > am wondering that results are not consistent. I guess some mistake > in my > definition of the lattice in MEEP ctl file.
In Meep, you have to use a rectangular supercell (as you are doing). This contains more than one primitive cell of a triangular lattice, and as a result the band structure is folded. To compare to MPB, the simplest thing to do is to also use a rectangular supercell. However, note that the k-points in MPB are given in the basis of the reciprocal lattice, while in Meep they are in Cartesian coordinates. In the long term, however, in order to plot the band diagram in a sensible way, you will want to "unfold" it to get the band diagram as a function of the k-point in the Brillouin zone of the primitive lattice. There are a variety of ways to do this, and the subject has been discussed on the mailing list before -- look through the archives. Steven _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
