<div dir="ltr"><br><div class="gmail_extra">Dear Tommaso,<br><br></div><div class="gmail_extra">see below.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, May 16, 2014 at 10:40 AM, Tommaso Francese <span dir="ltr"><<a href="mailto:neutrinofrancese@gmail.com" target="_blank">neutrinofrancese@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear all,<br>
as you suggested, i try to follow your tutorial for the Hubbard U coefficients determination, but i have some practical difficulties.<br>
<br>
Summarizing, i proceded as follow:<br>
<br>
step 1)—> i have done a simple SCF with very low coefficients for Hubbard_U1 and Hubbard_U2, enabling the wavefunction separate collection (wf_collect) ;<br></blockquote><div><br></div><div>I don't think wf_collect is necessary. should not be harmful either<br>
</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
step 2)—> i have performed some SCF, restarting from the charge file stored previously, introducing some fluctuation values in Hubbard_alpha (?), is it correct?<br>
<br></blockquote><div><br></div><div>right.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
the problem is at this point: do i need to rename every scf-file in which i performed a different perturbation? </blockquote><div><br><br></div><div>yes, otherwise you overwrite them each time. or you can redirect them to different (properly named) directories.<br>
</div><div><br> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">How can i, in the next step, “recall” the different perturbation that i performed previously?<br>
<br></blockquote><div><br></div><div>what do you exactly mean by "recall"? do you have difficulties in recognizing outputs corresponding to different alphas? then see the naming problem at the previous point.<br>
</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
At this point is obvious that i don’t know also how to calculate the response functions and so, obtaining the Hubbard U coefficient.<br>
<br></blockquote><div><br></div><div>this is what the tutorial is for. were you able to follow the instructions to the end? Besides the one from the Santa Barbar school there is also another one from a nother school in 2012 at Penn State. Maybe that is better?<br>
<br></div><div>best,<br><br>Matteo<br><br><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Can someone help me?<br>
Thanks a lot,<br>
Tommaso,<br>
Università Cà Foscari of Venice<br>
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