<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><pre>Dear PW-users,<br>I would like to perform LDA+U calculations,<br>however I have some difficulties in extraction of Hubbard U.<br>As I understood there are four steps of getting this potential:<br>• Run a self consistent (unperturbed) calculation.<br>• Starting from saved potential and wavefunction add the perturbation<br>• The response χ0 is evaluated at the first iteration (at fixed potential)<br>• The response χ is evaluated at self consistency<br>I don't actually understand how to get χ0 and χ from output file. In Ph.D thesis <br>of Matteo Cococcioni it is said that in order to extract the Hubbard U the one needs <br>to find LDA total energy as a function of the total d level occupancy of one<br>”Hubbard” site, but I can't relate these words with output information of my calculations.<br><span style="font-style: italic;"><span
style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><br></span></span></span></span>Thanks in advance,<br><br>Sincerely<br>Maxim<br><br><i></i><br><br></pre></td></tr></table><br>
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