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Why multiple k-point shifts recommended?


Chronological Thread 
  • From: jjr19@uakron.edu
  • To: forum@abinit.org
  • Subject: Why multiple k-point shifts recommended?
  • Date: Fri, 21 Mar 2008 02:03:00 +0100

In the documentation for shiftk, multiple k-point shifts are recommended for
certain kinds of lattices, and from a brief look at the ABINIT code, all
these shifts seem to be added to a k-point more or less one right after the
other, with some sort of normalizing (?) done after each shift. I'm not sure
though what the difference is supposed to be between this:

nshiftk 4
shiftk 0.5 0.5 0.5
0.5 0.0 0.0
0.0 0.5 0.0
0.0 0.0 0.5

and this:

nshiftk 1
shiftk 1.0 1.0 1.0



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