<p style="line-height: 150%;"><span lang="EN-GB" style="font-family: "Helvetica Neue";">Dear colleagues, </span></p>
<p style="line-height: 150%;"><span lang="EN-GB" style="font-family: "Helvetica Neue";"> </span><span style="font-family: "Helvetica Neue";">Could you please help me to understand the CP2K
implementation of ROKS and the Wannier Centers.</span></p>
<p style="line-height: 150%;"><span lang="EN-GB" style="font-family: "Helvetica Neue";">I am facing the following two problems. I can't find
an answer in the documentation. And, unfortunately, I don't really understand
in the code.</span></p>
<p style="line-height: 150%;"><span lang="EN-GB" style="font-family: "Helvetica Neue";">1) The ROKS implementation in CP2K uses a
spin-restricted calculation with multiple density matrices. As I understand it,
this leads to some problems with printing CUBE files (for example, for each
orbital it prints two cube files for spin_1 and spin_2). Which one is correct? Maybe
the sum of them gives a correct density? </span></p><p style="line-height: 150%;"><span lang="EN-US" style="font-family: "Helvetica Neue";">(in log it print “</span><span lang="EN-GB" style="font-family: "Helvetica Neue";">Unclear how we define MOs in the restricted case ...
skipping”)</span></p>
<p style="line-height: 150%;"><span lang="EN-US" style="font-family: "Helvetica Neue";"> </span></p>
<p style="line-height: 150%;"><span lang="EN-GB" style="font-family: "Helvetica Neue";">2)
I’m trying to use Wannier Centres with ROKS, but it doesn’t work in CP2K. As I
understand this is also a multiple density matrix problem. I need Wannier
Centres only (Many-body Position operator, no Jacobi rotation). Right now I use
Wannier + ROKS in CPMD, and in CPMD the rotation is just switched off for the
last two orbitals (diag(1,1)).</span><span style="font-family: "Helvetica Neue";"> </span></p>
<p style="line-height: 150%;"><span lang="EN-GB" style="font-family: "Helvetica Neue";">Best
regards</span></p>
<p style="line-height: 150%;"><span lang="EN-GB" style="font-family: "Helvetica Neue";">Ilya</span></p>
<p></p>
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