The latest approaches to find the band-gap of Phononic / Periodic materials?

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I have get this error when i calculated the geometrical optimization for prco3, it takes 12 hours until gives this message in the outputfile?

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Stuart Barth

For arbitrary unit cells, your best bet is an eigenmode simulation. Sweep the Bloch phase shifts across the various axes from 0 to pi and solve for the eigenfrequencies. The regions in which there are no found eigenfrequencies are your band gaps.

Linh Nguyen Van

That is a good question.