confusing behavior of mrgddb with nkpt

Phonons, DFPT, electron-phonon, electric-field response, mechanical response…

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jzwanzig
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confusing behavior of mrgddb with nkpt

Post by jzwanzig » Fri Aug 03, 2012 3:44 pm

Hi,

I am having a problem merging DDB's with mrgddb, I have run into a case where the mrgddb code stops and complains that the different DDB's have different values of nkpt. I've never seen this before and I don't understand it--it is normal to run phonons with kptopt 3 and the gamma point, electric field, and strains with kptopt 2, therefore different DDB's will often have different values of nkpt, and I have used mrgddb in lots of other systems in this way and never run into this problem before. Any suggestions?

Joe
Josef W. Zwanziger
Professor, Department of Chemistry
Canada Research Chair in NMR Studies of Materials
Dalhousie University
Halifax, NS B3H 4J3 Canada
jzwanzig@gmail.com

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