[QE-users] Too many r-vectors error while running cp.x

2019-03-17 Thread 대학원생
Hello,

I'm trying to run the Car-Parrinello dynamics on a pentacene-fullerene system.
When I run the electronic minimization with cp.x, it shows the error, "too many 
r-vectors." This error is always reproducible when I use the van der Waals 
correction, 'dft-d'. I guess that the electronic minimization without the vdw 
correction is probably reliable because the ions are fixed, but eventually I 
need to run the molecular dynamics with the option. (I found out that the same 
error also occurs in the md option.) So, how can I solve this problem?

Any help is greatly appreciated.

Thank you.

Daeho Han

Here's the input file:

  calculation = 'cp',
  restart_mode = 'from_scratch'
  pseudo_dir = '/home/dhhan/program/qe-6.3/pseudo/',
  outdir = './',
  prefix = 'x',
  tprnfor = .true.
  disk_io = 'low',
  ndw = 50
  nstep = 10
  dt = 2.5
  iprint=1
  isave = 100
  etot_conv_thr = 1.d-9
  ekin_conv_thr = 1.d-4
/


  ibrav = 0,
  celldm(1) = 1.89 ,
  nat = 96,
  ntyp = 2,
  nspin = 1,
  nbnd = 200,
  ecutwfc = 50,
  tot_charge = 0.0,
  nr1b = 10,
  nr2b = 10,
  nr3b = 10,
  vdw_corr = 'dft-d'
/


  electron_dynamics = 'sd'
  emass = 400.d0
/

$IONS
  ion_dynamics = 'none'
/
$CELL
  cell_dynamics = 'none'
  press = 0.0d0
/

ATOMIC_SPECIES
 C  12.01  c_pbe_v1.2.uspp.F.UPF
 H  1.008  h_pbe_v1.4.uspp.F.UPF

CELL_PARAMETERS {alat}
30.0000.0000.000
 0.000   30.0000.000
 0.0000.000   30.000

ATOMIC_POSITIONS {alat}
C-3.620019680  -1.596664767  -2.981088793
C-5.049446573  -1.551957644  -2.955719388
H-5.550242110  -1.531945305  -1.981688934
C-5.773877596  -1.521724485  -4.118155337
C-5.113314586  -1.543823352  -5.386022394
C-3.746249846  -1.598321275  -5.458279948
H-3.235876507  -1.613352411  -6.427434150
C-2.947413637  -1.623340762  -4.272153533
C 0.711467886  -1.297048188  -0.731337101
C-0.681004135  -1.450567531  -0.684622495
H-1.188646096  -1.415069620   0.286226517
C-1.448496595  -1.570983559  -1.850510970
C-0.773974552  -1.606764345  -3.143573693
C 0.624803034  -1.523543426  -3.185386085
H 1.130607036  -1.539147286  -4.157616134
C 1.386147130  -1.333864744  -2.023964228
H 5.501737273   0.131789158   2.326306574
C 4.932192343  -0.130321082   1.429616510
C 3.599383930  -0.431413616   1.525858698
H 3.088198215  -0.413607385   2.494648776
C 2.834738057  -0.763753469   0.363647824
C 3.506845025  -0.788914066  -0.927490969
C 4.901012359  -0.474472537  -0.977381056
H 5.401262401  -0.489054724  -1.951679285
C 5.591546399  -0.150689817   0.161194947
H 6.655448371   0.097458132   0.105475937
C 2.775571895  -1.092116620  -2.072233651
C 1.471725180  -1.035054217   0.428251941
C-2.859620257  -1.589702670  -1.816319912
C-1.556829295  -1.648461975  -4.317425599
H-6.866387935  -1.476959384  -4.082946616
H-5.710282815  -1.514110422  -6.302383669
H-3.365609741  -1.562799799  -0.844115136
H-1.051325976  -1.666342639  -5.290100609
H 3.281517719  -1.106238988  -3.044716269
H 0.963211455  -1.006611265   1.399081785
C-0.513273424   6.385540559   0.645143886
C-1.684255282   5.529884159   0.642596711
C-1.232546111   4.151635345   0.640753255
C 0.217273101   4.154931930   0.642235014
C 0.662171269   5.535796350   0.644345310
C 1.791785119   5.907237005  -0.089593407
C 2.519160733   4.911448331  -0.853855057
C 2.090321693   3.580903795  -0.856042131
C 0.917587645   3.195443892  -0.094499559
C 0.195304399   2.196897077  -0.858740117
C-1.201784605   2.193288767  -0.860281083
C-1.927907483   3.189338378  -0.097079156
C-3.102118197   3.569516795  -0.859113865
C-3.537469491   4.897345340  -0.856060062
C-2.815325479   5.896019655  -0.091384560
C-2.819230145   7.131371389  -0.851267102
C-3.544097170   6.896056651  -2.085379579
C-3.988198258   5.515340327  -2.087857262
C-3.986382454   4.781958166  -3.277291825
C-3.536275201   3.403038206  -3.280301332
C-3.101477979   2.807540389  -2.093038977
C-1.927775755   1.956038993  -2.093737695
C-1.228673483   1.734470822  -3.282392101
C 0.221199780   1.740407794  -3.280758005
C 0.920410155   1.966792484  -2.093041655
C 2.091247837   2.820536599  -2.091463512
C 2.524135295   3.417735819  -3.279291856
C 2.968491525   4.798694298  -3.276987984
C 2.966345651   5.532053762  -2.086567670
C 2.514296188   6.910346651  -2.084569182
C 2.081635913   7.507035534  -3.272766097
C 2.084051019   6.746476570  -4.508346479
C 2.519065478   5.417523089  -4.510238633
C 1.795668169   4.418189088  -5.274193365
C 1.798791742   3.182704328  -4.513220249
C 0.668797905   2.358585627  -4.513405104
C-0.505696107   2.738310163  -5.275979917
C-1.678466595   2.352184004  -4.514278903
C-2.811525902   3.170728513  -4.514359178
C-2.813492548   4.406743522  -5.273955466
C

[QE-users] Specific energy of the system increases with increase of supercell. Why?

2019-03-17 Thread Evgeny Permyakov
I use wide-spread ribbon model for MoS2 edge. To ensure correctness of
the model I calculated supercells with 2,3,4,6 periods (Mo atoms)
along the edge. I expected that at least for one row of 2-4-6 or 3-6 I
would see constant specific energy per edge Mo atom.

Instead I see a slight, but constant increase in specific energy. The
increase is small (~0.2 eV/period) but constant. It was observed for
series with 2k points for all supercell sizes and for series where I
used such number of K-point that product of supercell size and number
of k-points were preserved.  I could dismiss it, but ! That increase
is observed for some structures in same model and not observed for
others. If the increase was uniform between structures, I could
dismiss it. As of now I need to understand where it comes from. What I
should see for in my results and what could be the reason?

Interestingly, when I run same calculation with Gamma-point, I saw
different pattern, but this is of no importance now.
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Re: [QE-users] qe-6.4: problem with fs.x

2019-03-17 Thread Sylwia Golab
Dear Mr Giannozzi,


Thank you for you reply and sincerely apologize for the wrong guess I have 
made.The problem appears with qe-6.4 compiled with intel v. 11 as well as with 
the one comming from Parallel Studio 2017. It does not appear with qe-6.3 
compiled on the same machines. My example input files (problem appears also 
with other, more realistic inputs) are as follows:
scf.in:
 
calculation='scf'
restart_mode='from_scratch',
prefix='Nb',
pseudo_dir = '/home/student3/qe/qe-6.0/pseudo/',
outdir='./tmp_dir/'
 /
 
ibrav= 3, celldm(1)=6.250946058252, nat= 1, ntyp= 1,
ecutwfc =50,  ecutrho=600,
occupations="smearing", smearing="m-v", degauss=0.02
 /
 
conv_thr = 1.0e-11
mixing_beta = 0.7
 /
ATOMIC_SPECIES
 Nb  92.906   Nb.pbe-spn-rrkjus_psl.1.0.0.UPF
ATOMIC_POSITIONS
 Nb 0.00 0.00 0.00
K_POINTS automatic
4 4 4 0 0 0



dos.in
 
calculation='nscf'
restart_mode='from_scratch',
prefix='Nb',
pseudo_dir = '/home/student3/qe/qe-6.0/pseudo/',
outdir='./tmp_dir/'
 /
 
ibrav= 3, celldm(1)=6.250946058252, nat= 1, ntyp= 1,
ecutwfc =50,  ecutrho=600,
occupations="tetrahedra" 
 /
 
conv_thr = 1.0e-11
mixing_beta = 0.7
 /
ATOMIC_SPECIES
 Nb  92.906   Nb.pbe-spn-rrkjus_psl.1.0.0.UPF
ATOMIC_POSITIONS
 Nb 0.00 0.00 0.00
K_POINTS automatic
4 4 4 0 0 0



fs.in

outdir='./tmp_dir/'
prefix='Nb'
/



Firstly I am running mpirun -np 4 pw.x scf.out and I can grep Fermi energy from 
*xml files: 

[student3 qe4]$ grep fermi tmp_dir/*
tmp_dir/Nb.xml:  6.529259765371975e-1>


Then I am running mpirun -np 4 pw.xdos.out and now I cannot see the Fermi 
energy in *xml:
[student3 qe4]$ grep fermi tmp_dir/*(nothing appears)


But for sure the Fermi energy is computed in nscf cycle, because I can grep it 
from dos.out file:
[student3 qe4]$ grep Fermi *
dos.out: the Fermi energy is18.0671 ev
scf.out: the Fermi energy is17.7670 ev



As I mentioned before, after running mpirun -np 4 fs.xfs.out I see in the 
fs.out file the line:

1 bands found crossing Ef =0.00


When I changed the fermisurface.f90 such that it is reading Fermi energy from 
dos.out, then the program fs.x works very well (in agreement with the results 
obtained with qe-6.3).



I would like to thank you for your help in advance.
Best regards,
Sylwia




>>>  03/16/19 12:02 PM >>>

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Today's Topics:

   1. Negatively charged isolated molecule (Ernane de Freitas Martins)
   2. qe-6.4: problem with fs.x (Sylwia Golab)
   3. Re: Negatively charged isolated molecule (Giuseppe Mattioli)
   4. Re: Negatively charged isolated molecule
  (Ernane de Freitas Martins)
   5. Re: Negatively charged isolated molecule (Michal Krompiec)
   6. Re: How to calculate water molecule energy at large cell
  size? (Paolo Giannozzi)
   7. Re: qe-6.4: problem with fs.x (Paolo Giannozzi)
   8. Re: Negatively charged isolated molecule (Nattino Francesco)
   9. How can read constant velocity from input file when
  restart_mode= 'restart' (=?ISO-8859-1?B?THUgSGFpbGluIA==?=)


--

Message: 1
Date: Fri, 15 Mar 2019 13:54:49 -0300
From: Ernane de Freitas Martins 
To: users@lists.quantum-espresso.org
Subject: [QE-users] Negatively charged isolated molecule
Message-ID:

Content-Type: text/plain; charset="utf-8"

Hello,

I'm experiencing a problem to run a negatively charge molecule in quantum
espresso. The system is CO32-.

I try both vacuum and solvated (environ) calculations. The solvated one
works fine.

The problem is the calculation in vacuum. It never give the first ionic
step because the SCF accuracy never reaches the convence criterion.

I tried many different solutions (increase cutoffs and box size, use assume
isolated, decreasing and changing the mixing scheme and etc) and nothing
works.

The unique calculation that works fine for vacuum is the one with a box
size of 7.9 x 7.9 x 7.9 A. I really don't understand why it only works for
this specific box size.

I ran several other charged systems (+1, +2 and -1 total charge) and all of
them worked fine. The problem appears for -2 total charge in vacuum.

Would some of you kindly help me in this?

Cheers,

Dr. Ernane de Freitas Martins
Postdoctoral researcher
IF - USP
S?o Paulo, SP - Brazil
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Message: 2
Date: Fri, 15 Mar 2019 18:56:38 +0100

Re: [QE-users] Problem with tetrahedra method: from tetra_init : error # 26, cannot remap grid on k-point list

2019-03-17 Thread Pacome NGUIMEYA
Dear Pietro,

I ran the scf calculation follows by the nscf calculation with
occupation='smearing', smearing and degauss (with QE-6.3.0). 
I added  bz_sum = 'tetrahedra_opt' in the dos.x input file and I ran 
it but, it crashed and I got the following error message

 task # 0
 from dos : error #19
 reading dos namelist

Apparently, the tetrahedron method is used if

 - "the input data file has been produced by pw.x using the
option
occupations='tetrahedra', AND"
 - "a value for degauss is not given as input to namelist "

read here https://gitlab.com/QEF/q-e/blob/qe-6.3/PP/Doc/INPUT_DOS.txt

But pw.x (nscf) does not work in my case

Further research on the internet led me to this website 
https://eamonnmurray.gitlab.io/modelling_materials/lab04/ where I could
read that
 
"Essentially this corresponds to doing a three dimensional linear
interpolation from a regular grid of values."..."It’s important to note
that in a real measurement of the density of states of a system the
there is an implicit broadening that comes from

1. Electron-phonon coupling: the states are not simply at a fixed
energy, but will have some distribution as the atoms vibrate.

2. Any measurement probe will have a finite energy width associated
with it, which will limit how finely it can resolve density of states
features.

So while tetrahedron may seem the more accurate approach, you shouldn’t
necessarily think of it as a more correct representation of a real
system."

I think I am just going to use the common way, that is, running the
nscf calculation with smearing and degaus. Then, run this code


prefix = '...',
outdir = '...',
fildos = 'dos.dat',
 /
and plot the DOS.

Regards - Pacome
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