<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-size:small">Dear Giovanni Cantele,</div><div class="gmail_default" style="font-size:small">Thank you for your reply.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Actually, a colleague of mine perform the relaxation, but maybe he sent me the wrong file mistakenly.</div><div class="gmail_default" style="font-size:small">Thank you very much for your clarification. I'm going to check what you said and perform the relaxation on the system.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Regarding PAW-based PPs, I tested them and also did with USPPs. But things went on the same way.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Best regards,</div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"></blockquote><span style="text-align:center;color:rgb(0,0,0)"><div style="text-align:left"><span style="font-style:italic"><span style="font-style:normal"><font face="times new roman, serif">Marcelo Albuquerque</font></span></span></div></span><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"></blockquote><span style="text-align:center;color:rgb(0,0,0)"><div style="text-align:left"><font face="times new roman, serif">Ph.D. Candidate</font></div></span><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"></blockquote><span style="text-align:center;color:rgb(0,0,0)"><div style="text-align:left"><font face="times new roman, serif">Institute of </font><span style="font-family:"times new roman",serif">Physics</span></div></span><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"></blockquote><span style="color:rgb(0,0,0);text-align:center"><div style="text-align:left"><font face="times new roman, serif">Fluminense Federal University</font></div></span><div><div><div style="text-align:left"><font color="#000000" face="times new roman, serif"><span style="background-color:rgb(255,255,255)">Niterói/RJ - Brazil</span></font></div></div></div><div><div dir="ltr"><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"></blockquote></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jul 21, 2021 at 7:01 AM <span class="gmail_default" style="font-size:small"></span>Giovanni Cantele wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Hi Marcelo,<br>
<br>
I do not see an evident reason why you should find a discrepancy. However, by looking to Fig. 1b of the first reference and to the side view of you structure (as obtained by opening the scf input directly with XcrysDEN), it seems to me that there is some difference in the z coordinates. Also, I tried (but I don?t know if in the correct way) to calculate "the puckered height between P?P and Ge?Ge? as mentioned in the reference. Again, your structure seems to be different. Did you relax the structure before making the scf? What is the value of ?Total force? at the end of the scp output?<br>
<br>
Giovanni<br>
<br>
PS is there any reason why not trying with PAW pseudo potentials requiring a much smaller cutoff?<br>
(this has of course nothing to do with your issue)<br>
<br>
> On 20 Jul 2021, at 17:42, Marcelo Albuquerque <<a href="mailto:marcelofilho@id.uff.br" target="_blank">marcelofilho@id.uff.br</a>> wrote:<br>
> <br>
> Dear users,<br>
> <br>
> I'm trying to calculate the electronic band structure of GeP3, but I haven't been able to reproduce it, as shown in both references below. <br>
> <br>
> a) Bowen Zeng et al 2018 J. Phys. D: Appl. Phys. 51 235302;<br>
> b) Yu Jing, et al, Nano Lett. 2017, 17, 3, 1833?1838.<br>
> <br>
> BTW, they were computed using VASP code, and I don't understand why I'm facing such an issue. I have already tried many different approaches to calculate this band structure, but it simply doesn't work.<br>
> <br>
> Here follows the inputs I used for the scf and the bands calculations. <br>
> <br>
> A) SCF<br>
> &control<br>
> prefix='gep',<br>
> calculation='scf'<br>
> nstep=0<br>
> tstress=.false.<br>
> tprnfor= .true.<br>
> etot_conv_thr = 1.0D-5<br>
> forc_conv_thr = 1.0D-7<br>
> pseudo_dir = '/home/malbuquerque/pseudos/',<br>
> outdir='./'<br>
> /<br>
> &system<br>
> ibrav= 4,<br>
> a= 6.982664008,<br>
> c = 16.000000000,<br>
> nat= 8,<br>
> ntyp= 2,<br>
> ecutwfc = 120,<br>
> nbnd = 40<br>
> vdw_corr='grimme-d2'<br>
> occupations='fixed',<br>
> /<br>
> &electrons<br>
> electron_maxstep = 400<br>
> conv_thr = 1.0d-12<br>
> diagonalization='david'<br>
> mixing_mode='plain'<br>
> mixing_beta= 0.7<br>
> /<br>
> &ions<br>
> ion_dynamics='bfgs'<br>
> /<br>
> &CELL<br>
> cell_dynamics = 'bfgs',<br>
> press_conv_thr = 0.5,<br>
> cell_factor = 2.0,<br>
> cell_dofree = '2Dxy',<br>
> /<br>
> ATOMIC_SPECIES<br>
> Ge 72.640 Ge.pbe-hgh.UPF<br>
> P 30.974 P.pbe-hgh.UPF<br>
> ATOMIC_POSITIONS crystal<br>
> Ge 0.836927687 0.360474777 0.413486925<br>
> Ge 0.503586578 0.693798663 0.359352022<br>
> P 0.325445130 0.871903831 0.425075713<br>
> P 0.859830506 0.871910609 0.425081984<br>
> P 0.325454709 0.337550097 0.425072126<br>
> P 0.014988446 0.182362365 0.347653353<br>
> P 0.014997809 0.716639703 0.347643675<br>
> P 0.480752135 0.182372957 0.347659202<br>
> K_POINTS automatic<br>
> 13 13 1 0 0 0<br>
> <br>
> <br>
> B) BANDS<br>
> &control<br>
> prefix='gep',<br>
> calculation='bands'<br>
> nstep=0<br>
> tstress=.false.<br>
> tprnfor= .true.<br>
> etot_conv_thr = 1.0D-5<br>
> forc_conv_thr = 1.0D-7<br>
> pseudo_dir = '/home/malbuquerque/pseudos/',<br>
> outdir='./'<br>
> /<br>
> &system<br>
> ibrav= 4,<br>
> a= 6.982664008,<br>
> c = 16.000000000,<br>
> nat= 8,<br>
> ntyp= 2,<br>
> ecutwfc = 120,<br>
> nbnd = 40<br>
> vdw_corr='grimme-d2'<br>
> occupations='fixed',<br>
> /<br>
> &electrons<br>
> electron_maxstep = 400<br>
> conv_thr = 1.0d-12<br>
> diagonalization='david'<br>
> mixing_mode='plain'<br>
> mixing_beta= 0.7<br>
> /<br>
> &ions<br>
> ion_dynamics='bfgs'<br>
> /<br>
> &CELL<br>
> cell_dynamics = 'bfgs',<br>
> press_conv_thr = 0.5,<br>
> cell_factor = 2.0,<br>
> cell_dofree = '2Dxy',<br>
> /<br>
> ATOMIC_SPECIES<br>
> Ge 72.640 Ge.pbe-hgh.UPF<br>
> P 30.974 P.pbe-hgh.UPF<br>
> ATOMIC_POSITIONS (crystal)<br>
> Ge 0.836927687 0.360474777 0.413486925<br>
> Ge 0.503586578 0.693798663 0.359352022<br>
> P 0.325445130 0.871903831 0.425075713<br>
> P 0.859830506 0.871910609 0.425081984<br>
> P 0.325454709 0.337550097 0.425072126<br>
> P 0.014988446 0.182362365 0.347653353<br>
> P 0.014997809 0.716639703 0.347643675<br>
> P 0.480752135 0.182372957 0.347659202<br>
> K_POINTS crystal_b<br>
> 4<br>
> 0.000000000 0.000000000 0.000000000 30 !! Gamma<br>
> 0.333333333 0.333333333 0.000000000 30 !! K<br>
> 0.500000000 0.000000000 0.000000000 30 !! M<br>
> 0.000000000 0.000000000 0.000000000 30 !! Gamma<br>
> <br>
> <br>
> <br>
> In fact, I used the the QE versions6.7, 6.6 and 6.4.1, which gave me the same strange result. I'm also sending a PNG file showing the obtained bands. The red line is the VBM, and the blue one is the CBM (or it was supposed to be). What is weird is that I was expecting (according to the aforementioned reference) that the blue band was located a little bit above where it is in this figure. Also the orange one should be a little bit above, close to the VBM.<br>
> <br>
> Could anyone help me or give me some advice about this problem. I really appreciate it in advance.<br>
> <br>
> <br>
> With all the best regards,<br>
> Marcelo Albuquerque<br>
> Ph.D. Candidate<br>
> Institute of Physics<br>
> Fluminense Federal University<br>
> Niter?i/RJ - Brazil<br>
> <bandsGeP3_pw-users.png>_______________________________________________<br>
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