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Dear Louis,</div>
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I am interested in the defect chemistry of actinide oxide materials. Currently I am studying the defect formation in bulk CeO2 using CASTEP and ONETEP. With CASTEP I find without the use of OMC with DFT+U I get what are referred to in the literature as "metastable"
states. For example, the removal of an oxygen from bulk CeO2 leaves behind 2 electrons in the vacant site. Each of these electrons should localise onto 1 adjacent Ce site each. Without OMC, the two electrons localise across several adjacent Ce sites, which
is a known issue reported in literature.</div>
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If you would not mind, I would like to access to QE version with your implementation with OMC.</div>
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Affiliation: University of Southampton</div>
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Many thanks,</div>
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Nabeel</div>
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Nabeel Anwar MSci, AMRSC</p>
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PhD Chemistry</p>
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Skylaris Research Group</p>
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School of Chemistry, <span style="font-size:12pt">University of Southampton</span></p>
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<span style="font-size:12pt"><span style="font-family:Calibri,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">EPSRC </span><span style="margin:0px; font-family:Calibri,Helvetica,sans-serif; background-color:rgb(255,255,255)">CDT
in </span><span style="font-family:Calibri,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">Theory & Modelling in Chemical Sciences (TMCS)</span><br>
</span></p>
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<a href="mailto:na5g20@soton.ac.uk" title="na5g20@soton.ac.uk">E-mail</a> |<span> </span><a href="https://www.linkedin.com/in/nabeel-anwar-b0b1b7aa/" title="https://www.linkedin.com/in/nabeel-anwar-b0b1b7aa/" style="margin:0px">LinkedIn</a><span> </span>|<span> </span><a href="https://orcid.org/0000-0003-1221-9256" title="https://orcid.org/0000-0003-1221-9256" style="margin:0px">ORCID</a><span> </span>|<span> </span><a href="https://www.researchgate.net/profile/Nabeel_Anwar2" title="https://www.researchgate.net/profile/Nabeel_Anwar2" style="margin:0px">ResearchGate</a></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> users <users-bounces@lists.quantum-espresso.org> on behalf of Ponet Louis Maurice via users <users@lists.quantum-espresso.org><br>
<b>Sent:</b> Friday, June 10, 2022 16:00<br>
<b>To:</b> users@lists.quantum-espresso.org <users@lists.quantum-espresso.org><br>
<b>Subject:</b> [QE-users] DFT + U Occupation Matrix Control (OMC)</font>
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<div class="PlainText">CAUTION: This e-mail originated outside the University of Southampton.<br>
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Dear Nabeel,<br>
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Currently the only method of having some control over the occupation matrix is by using the flag starting_ns_eigenvalue, together with mixing_fixed_ns. Different from VASP and ABINIT, this only gives you control over the eigenvalues, and the eigenvectors will
be those take from the occupation matrix after the first iteration. Depending on what you are trying to do this might be enough. If you need control over the full matrix, I have a personal version where I implemented this, but haven’t gotten around to providing
a PR on the official QE code repository. Let me know in case it would be useful to you.<br>
<br>
Best,<br>
Louis<br>
<br>
—<br>
PostDoc at THEOS, EPFL, Lausanne, Switzerland<br>
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