<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">Dear Carlos and Quantum Espresso friends,</div><div class=""><br class=""></div><div class="">In the past, I had severe problems with symmetry detection by Quantum Espresso.</div><div class="">I’m studying stepped surfaces, such as Pt(221) and Pt(533) with S_2 symmetry.</div><div class="">Depending on how I define the unit cell and the positions of the slab atoms therein,</div><div class="">QE could or could not detect right symmetry.</div><div class=""><br class=""></div><div class="">Someone pointed out to use gener_3d_slab tool from thermo_pw to generate</div><div class="">the structures. Indeed, the structures generated by gener_3d_slab are better</div><div class="">handled by QE with respect to symmetry detection, but it is not 100% user proof.</div><div class="">Even now, I have systems where I start with relaxing a structure with S2 symmetry, </div><div class="">but loosing the symmetry upon restarts of the calculations. In the latter case, I need</div><div class="">to redefine the positions of the slab atoms to regenerate the right symmetry.</div><div class=""><br class=""></div><div class="">B.t.w. thermo_pw is located here:</div><div class=""><br class=""></div><div class=""><a href="https://github.com/dalcorso/thermo_pw" class="">https://github.com/dalcorso/thermo_pw</a> </div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><br class=""><div class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Met vriendelijke groeten,</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Mit freundlichen Grüßen,</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">With kind regards,</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br class=""></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br class=""></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Willem Offermans</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Researcher Electrocatalysis SCT</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">VITO NV | Boeretang 200 | 2400 Mol</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Phone:+32(0)14335263 Mobile:+32(0)492182073 </div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br class=""></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-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<div><br class=""><blockquote type="cite" class=""><div class="">On 23 Mar 2021, at 10:45, Carlos Reis <<a href="mailto:carlos.loia.reis@gmail.com" class="">carlos.loia.reis@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div dir="ltr" class="">Dear Paolo<div class=""><br class=""></div><div class="">Thank you very much for your feedback.</div><div class=""><br class=""></div><div class="">Is there any tool that I can use to convert the unit cell vectors and atomic positions in a format so that q-e recognize the correct symmetry and generates the appropriate input for q-e?</div><div class=""><br class=""></div><div class="">Best regards,</div><div class="">Carlos Reis.</div><div class=""><br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 22, 2021 at 8:50 PM Paolo Giannozzi <<a href="mailto:p.giannozzi@gmail.com" class="">p.giannozzi@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr" class=""><div class="">Well, no, it's the same problem that was reported some time ago. Your lattice has a higher symmetry (tetragonal I) than triclinic (ibrav=14):<br class=""></div><div class="">   ibrav     = 7, celldm(1) =     16.22739617, celldm(3) =      0.6324556</div><div class="">corresponding to crystal axes (alat units)<br class="">               a(1) = (   0.500000  -0.500000   0.316228 )<br class="">               a(2) = (   0.500000   0.500000   0.316228 )<br class="">               a(3) = (  -0.500000  -0.500000   0.316228 )</div><div class="">with atomic positions (no warranty):<br class=""></div><div class="">ATOMIC_POSITIONS {alat}<br class="">         Si  0.0000000   0.0000000   0.0000000<br class="">         Si  0.4000000   0.8000000   0.0000000<br class="">         Si  0.6000000   0.2000000   0.0000000<br class="">         Si  0.2000000   0.4000000   0.0000000<br class="">         Si  1.0000000   0.5000000   0.1581139<br class="">         Si  0.6000000   0.7000000   0.1581139<br class="">         Si  0.4000000   0.3000000   0.1581139<br class="">         Si  0.2000000  -0.1000000   0.1581139<br class="">         C   0.8000000   0.6000000   0.0000000<br class="">         C   0.8000000   0.1000000   0.1581139</div><div class=""><br class=""></div><div class="">The symmetry searching algorithm detects one symmetry, in addition to the identity, and this is compatible with the FFT grid computed for the tetragonal I lattice (48 48 48: the three lattice vectors have the same length), but not for the triclinic lattice (60 60 48: two vectors have the same length, different from the third).<br class=""></div><div class=""><br class=""></div><div class="">Paolo<br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 22, 2021 at 9:35 AM Paolo Giannozzi <<a href="mailto:p.giannozzi@gmail.com" target="_blank" class="">p.giannozzi@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr" class=""><div class="">Very strange. I have opened an item in the "Issues" section:</div><div class="">   <a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.com%2FQEF%2Fq-e%2F-%2Fissues%2F301&data=04%7C01%7C%7C3e970cb398c54300185008d8ede08d6b%7C9e2777ed82374ab992782c144d6f6da3%7C0%7C1%7C637520896009277291%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=jl2RQMMdINdF%2Funia4Q%2F1rj%2FD3P1XPyOjMMbMY%2Fe%2FsA%3D&reserved=0" originalsrc="https://gitlab.com/QEF/q-e/-/issues/301" shash="PBpuyAWk0mcSi/INqJdgiSJtYz74YqlzkpFlhE7qoCH98vGS3/Tn/pEgLginaQyjm25L+qClqjjsfZpdtL3O1ba5w+VY9TLt1FMOO8oHr4pBu1rrbuPDDlb95ouxPEsbUqOLz7S2IgT/syScJ7XvUNugLIeK/w8a7b36bzN9iAU=" target="_blank" class="">https://gitlab.com/QEF/q-e/-/issues/301</a></div><div class="">Paolo</div><div class=""><br class=""></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Mar 16, 2021 at 7:26 PM Carlos Reis <<a href="mailto:carlos.loia.reis@gmail.com" target="_blank" class="">carlos.loia.reis@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><font face="monospace" class="">Hello<br class=""><br class="">I use this file to perform a scf calculation<br class=""><br class="">&CONTROL<br class="">  calculation = 'scf',<br class="">   pseudo_dir = '.',<br class="">   wf_collect = .true.,<br class="">/<br class="">&SYSTEM<br class="">  ibrav     = 14,<br class=""> celldm(1) =     16.22739617<br class=""> celldm(2) =      1.00000000<br class=""> celldm(3) =      0.77459667<br class=""> celldm(4) =      0.64549723<br class=""> celldm(5) =      0.64549723<br class="">        nat =    10 ,<br class="">       ntyp =     2 ,<br class="">       nbnd =    28 ,<br class="">    ecutwfc =         30.000 ,<br class="">/<br class="">&ELECTRONS<br class="">  diagonalization = 'david',<br class="">/<br class="">ATOMIC_SPECIES<br class="">Si        28.085500                   Si.UPF<br class="">C         12.011000                    C.UPF<br class="">ATOMIC_POSITIONS {crystal}<br class="">   Si          -0.00000000     -0.00000000      0.00000000<br class="">   Si           0.40000000      0.80000000      0.00000000<br class="">   Si           0.60000000      0.20000000      0.00000000<br class="">   Si           0.20000000      0.40000000      0.00000000<br class="">   Si           0.75000000      0.25000000      0.50000000<br class="">   Si           0.35000000      0.45000000      0.50000000<br class="">   Si           0.15000000      0.05000000      0.50000000<br class="">   Si          -0.05000000     -0.35000000      0.50000000<br class="">   C            0.80000000      0.60000000      0.00000000<br class="">   C            0.55000000     -0.15000000      0.50000000<br class="">K_POINTS {automatic}<br class="">       4       4       4       1       1       1<br class=""></font><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">and then I run ph.x with this input file:</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><div class=""><font face="monospace" class="">--</font></div><div class=""><font face="monospace" class="">&inputph</font></div><div class=""><font face="monospace" class="">  prefix   = 'pwscf',</font></div><div class=""><font face="monospace" class="">  epsil    = .false.,</font></div><div class=""><font face="monospace" class="">  fildyn   = 'pwscf.dyn',</font></div><div class=""><font face="monospace" class="">  ldisp    = .true.</font></div><div class=""><font face="monospace" class="">  fildvscf = 'dvscf'</font></div><div class=""><font face="monospace" class="">  nq1=1,<br class=""></font></div><div class=""><font face="monospace" class="">  nq2=1,</font></div><div class=""><font face="monospace" class="">  nq3=1,</font></div><div class=""><font face="monospace" class=""> /<br class=""></font></div></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><div class=""><font face="monospace" class="">    Program PHONON v.6.7MaX starts on 16Mar2021 at 17:18:57</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     This program is part of the open-source Quantum ESPRESSO suite</font></div><div class=""><font face="monospace" class="">     for quantum simulation of materials; please cite</font></div><div class=""><font face="monospace" class="">         "P. Giannozzi et al., J. Phys.:Condens. Matter 21 395502 (2009);</font></div><div class=""><font face="monospace" class="">         "P. Giannozzi et al., J. Phys.:Condens. Matter 29 465901 (2017);</font></div><div class=""><font face="monospace" class="">          URL <a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.quantum-espresso.org%2F&data=04%7C01%7C%7C3e970cb398c54300185008d8ede08d6b%7C9e2777ed82374ab992782c144d6f6da3%7C0%7C1%7C637520896009287289%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=rOZrqPqvGT%2BQImKZ4wNCI033D2AiNFgh948QsjBrNuQ%3D&reserved=0" originalsrc="http://www.quantum-espresso.org/" shash="j+syNcMPYwDse6Rb0tV5BhnL0pWqXIWhEm4pyWKbmPpxI0VDGa4Onq0z/lNOthvLoHr6KZL56keX/oT8STFx7kqVvOVZp/RGA13oAeVnZrkdChITEVqIz4h0dAB65L7zMzxNr6B0UX9g1d/OiReVSbRDHyphvEBTP/0I8EiqiCE=" target="_blank" class="">http://www.quantum-espresso.org</a>",</font></div><div class=""><font face="monospace" class="">     in publications or presentations arising from this work. More details at</font></div><div class=""><font face="monospace" class="">     <a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.quantum-espresso.org%2Fquote&data=04%7C01%7C%7C3e970cb398c54300185008d8ede08d6b%7C9e2777ed82374ab992782c144d6f6da3%7C0%7C1%7C637520896009287289%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=4Oqhdt5NF54XRdTs%2F%2BV7mAKE0uFgGVMRU6yt3aJjPQw%3D&reserved=0" originalsrc="http://www.quantum-espresso.org/quote" shash="cFjitMZpUaM6TGV+YPZPedle+aYPVn/r9O8Qc5jpOqnt+zOfVdFMM1vSaGS+zc3pgLDPVVuKZYfGcO8XYugV/1TApFtqzryz414qIm5QhljL1Pj1Ps2ZkCOkCScQRmV9hfb+9s7KZL60LGFBuiljsm2mhGlmZnsXh773vsuI7jo=" target="_blank" class="">http://www.quantum-espresso.org/quote</a></font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     Parallel version (MPI), running on    16 processors</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     MPI processes distributed on     1 nodes</font></div><div class=""><font face="monospace" class="">     K-points division:     npool     =      16</font></div><div class=""><font face="monospace" class="">     Waiting for input...</font></div><div class=""><font face="monospace" class="">     Reading input from standard input</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     Reading xml data from directory:</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     ./pwscf.save/</font></div><div class=""><font face="monospace" class="">     file C.UPF: wavefunction(s)  3d renormalized</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     IMPORTANT: XC functional enforced from input :</font></div><div class=""><font face="monospace" class="">     Exchange-correlation= PZ</font></div><div class=""><font face="monospace" class="">                           (   1   1   0   0   0   0   0)</font></div><div class=""><font face="monospace" class="">     Any further DFT definition will be discarded</font></div><div class=""><font face="monospace" class="">     Please, verify this is what you really want</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     G-vector sticks info</font></div><div class=""><font face="monospace" class="">     --------------------</font></div><div class=""><font face="monospace" class="">     sticks:   dense  smooth     PW     G-vecs:    dense   smooth      PW</font></div><div class=""><font face="monospace" class="">     Sum        2521    2521    821                30009    30009    5631</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     Reading collected, re-writing distributed wavefunctions</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     Dynamical matrices for ( 1, 1, 1)  uniform grid of q-points</font></div><div class=""><font face="monospace" class="">     (   1 q-points):</font></div><div class=""><font face="monospace" class="">       N         xq(1)         xq(2)         xq(3)</font></div><div class=""><font face="monospace" class="">       1   0.000000000   0.000000000   0.000000000</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     Saving dvscf to file. Distribute only q points, not irreducible represetations.</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">     Calculation of q =    0.0000000   0.0000000   0.0000000</font></div><div class=""><font face="monospace" class="">     warning: symmetry operation #  2 not compatible with FFT grid.</font></div><div class=""><font face="monospace" class="">   1   0   0</font></div><div class=""><font face="monospace" class="">   0   1   0</font></div><div class=""><font face="monospace" class="">   1   1  -1</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class=""> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class=""> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</font></div><div class=""><font face="monospace" class="">     Error in routine phq_setup (1):</font></div><div class=""><font face="monospace" class="">     FFT grid incompatible with symmetry</font></div><div class=""><font face="monospace" class=""> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</font></div></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">Is there any way to easily fix this? should I have to manually specify nr1, nr2, nr3?</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">Any help is appreciated.</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class="">Best regards,</font></div><div class=""><font face="monospace" class="">Carlos Reis.</font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class=""><br class=""></font></div><div class=""><font face="monospace" class=""><br class=""></font></div></div></div></div>
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</blockquote></div><br clear="all" class=""><br class="">-- <br class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class="">Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,<br class="">Univ. Udine, via delle Scienze 206, 33100 Udine, Italy<br class="">Phone +39-0432-558216, fax +39-0432-558222<br class=""><br class=""></div></div></div></div></div>
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_______________________________________________<br class="">Quantum ESPRESSO is supported by MaX (<a href="http://www.max-centre.eu" class="">www.max-centre.eu</a>)<br class="">users mailing list <a href="mailto:users@lists.quantum-espresso.org" class="">users@lists.quantum-espresso.org</a><br class=""><a href="https://lists.quantum-espresso.org/mailman/listinfo/users" class="">https://lists.quantum-espresso.org/mailman/listinfo/users</a></div></blockquote></div><br class=""></body></html>