Hello I'm trying to reproduce a paper on bandgaps for 2D lattices. These authors report using a FEM method. I understand this approach is different from the one that MPB uses. And so are the results. I get very similar in shape dispersion diagrams but the bandgaps reported by them are completely different. I thought it could be provoked for ther lack of resolution of the simulation I ran, but the same results were obtained. I also changed the cell size for the averaging and the block size of the eigen solver but none of these parameters seemed to be the reason of the discrepancy. I also thought it could be the difference of the approaches to solve the eigenvalue problem, but I guess that a given geometry must have a unique dispersion diagram. Numeric errors are to be expected but I guess either one of us is doing something wrong. Anyone has any clue?
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