[QE-users] Dielectric function calculation using epsilon.x

Ait Lamine, Lahcen lahcen.aitlamine at edu.uiz.ac.ma
Tue Dec 5 12:14:09 CET 2023


Dear experts,

I used the epsilon.x post processing code to calculate the dielectric
function of a uniaxial material (ZnO) with a wurtzite hexagonal structure.
I obtained some disturbances in the elements of the dielectric tensors
along the x and y axes, which are expected to be almost equal. Below, you
will find some obtained values of the real part of the dielectric function.


- Part of the output file of the real part of dielectric function:

# energy grid [eV]     epsr_x  epsr_y  epsr_z
# plasmon frequences [eV]:    14.627589295   14.677369642   14.446354184
    0.000000000   18.922988610   18.618375287   14.192494432
    0.025041736   18.933113973   18.628003779   14.198207465
    0.050083472   18.963526887   18.656925069   14.215374417
    0.075125209   19.014335151   18.705244230   14.244078578
    0.100166945   19.085709122   18.773128155   14.284457818
    0.125208681   19.177866336   18.860791955   14.336702932
    0.150250417   19.291046919   18.968477188   14.401054849
    0.175292154   19.425476280   19.096418801   14.477800143
    0.200333890   19.581309760   19.244796033   14.567264017
    0.225375626   19.758551444   19.413660362   14.669799541
    0.250417362   19.956935821   19.602830378   14.785771400
    0.275459098   20.175755947   19.811739089   14.915531602
    0.300500835   20.413614809   20.039212833   15.059383507
    0.325542571   20.668066888   20.283152393   15.217528905
    0.350584307   20.935104146   20.540075410   15.389990581
    0.375626043   21.208424865   20.804464840   15.576499486
    0.400667780   21.478406815   21.067852594   15.776330948
    0.425709516   21.730694827   21.317555999   15.988067813
    0.450751252   21.944323131   21.534991138   16.209259550
    0.475792988   22.089360870   21.693541959   16.435934903
    0.500834725   22.124263850   21.756126325   16.661912389
    0.525876461   21.993548958   21.672966712   16.877840663
    0.550918197   21.627208660   21.380758472   17.069898017
    0.575959933   20.944453722   20.805447459   17.218106549
    0.601001669   19.865408864   19.871784752   17.294311943
    0.626043406   18.333722726   18.522446183   17.260116115
    0.651085142   16.348170232   16.745686867   17.065528981
    0.676126878   13.991416735   14.602373042   16.649903505
    0.701168614   11.435360773   12.235308929   15.947687976
    0.726210351    8.907967121    9.846345501   14.901899914
    0.751252087    6.630806607    7.644919102   13.486275950
    0.776293823    4.760052233    5.792695228   11.731009446
    0.801335559    3.360722532    4.371985600    9.738481050
    0.826377295    2.417949589    3.387461385    7.672776840
    0.851419032    1.867550392    2.790076088    5.719302247
    0.876460768    1.626289108    2.505507314    4.032807851
    0.901502504    1.612075793    2.455569876    2.701894195
    0.926544240    1.753492487    2.569744109    1.744365786
    0.951585977    1.991951326    2.788947760    1.126176923
    0.976627713    2.279975521    3.064793821    0.787279862
    1.001669449    2.578007890    3.356880884    0.662278835
    1.026711185    2.851157304    3.629722009    0.692262349
    1.051752922    3.066794104    3.850356606    0.829414284
    1.076794658    3.193854648    3.987567566    1.037356953
    1.101836394    3.204836067    4.013702617    1.289596815
    1.126878130    3.081203895    3.909841310    1.567472910
    1.151919866    2.821522818    3.673694694    1.858261148
    1.176961603    2.448820372    3.326911091    2.153639577
    1.202003339    2.011313254    2.916077134    2.448489437
    1.227045075    1.572410086    2.503268617    2.739927910
    1.252086811    1.192953726    2.148755031    3.026502093
    1.277128548    0.915096116    1.894895574    3.307550799
    1.302170284    0.755842892    1.759287908    3.582767708
    1.327212020    0.710765486    1.737994056    3.851951473
    1.352253756    0.762658135    1.813873978    4.114871207
    1.377295492    0.889794912    1.964698117    4.371165768
    1.402337229    1.071322166    2.168465077    4.620222739
    1.427378965    1.289777880    2.405816663    4.861013698
    1.452420701    1.531698924    2.660465281    5.091881646
    1.477462437    1.787263911    2.918581273    5.310290621
    1.502504174    2.049591529    3.167803024    5.512569387
    1.527545910    2.314013109    3.396296769    5.693720382
    1.552587646    2.577448942    3.592210737    5.847418994
    1.577629382    2.837922159    3.743908095    5.966364623
    1.602671119    3.094204402    3.841389708    6.043092314
    1.627712855    3.345573243    3.879068877    6.071150707
    1.652754591    3.591650906    3.859254815    6.046303465
    1.677796327    3.832276063    3.794488047    5.967463953
    1.702838063    4.067342542    3.706332459    5.837590146
    1.727879800    4.296547270    3.619741417    5.665048220
    1.752921536    4.519040438    3.555219647    5.465003391
    1.777963272    4.733028229    3.522810958    5.258873156
    1.803005008    4.935387092    3.520477700    5.070152360
    1.828046745    5.121316567    3.536418212    4.917726744
    1.853088481    5.284056522    3.553267233    4.810287142
    1.878130217    5.414771638    3.552569629    4.744741036
    1.903171953    5.502839235    3.518926906    4.708633966
    1.928213689    5.536880989    3.443460543    4.684675671
    1.953255426    5.506805616    3.325715530    4.655585627
    1.978297162    5.406718771    3.172992896    4.608325583
    2.003338898    5.237862868    2.997387643    4.537094769
    2.028380634    5.010259805    2.812636791    4.444310993
    2.053422371    4.742024753    2.632825356    4.339081532
    2.078464107    4.456292084    2.472554481    4.233676313
    2.103505843    4.176661432    2.346273116    4.139417536
    2.128547579    3.922680620    2.265649360    4.063480456
    2.153589316    3.706928630    2.236533621    4.007642754
    2.178631052    3.534458508    2.257808333    3.969312342
    2.203672788    3.404246493    2.322708490    3.944120611
    2.228714524    3.311692099    2.421433763    3.928492308
    2.253756260    3.251050446    2.543625500    3.920792689
    2.278797997    3.216855769    2.679999778    3.920899614
    2.303839733    3.204210430    2.823076380    3.929133096
    2.328881469    3.208734828    2.967199517    3.945376886
    2.353923205    3.226911572    3.108121739    3.968515543
    2.378964942    3.256618987    3.242496983    3.996163708
    2.404006678    3.297117845    3.367598475    4.024960937
    2.429048414    3.348257598    3.481299059    4.051514155
    2.454090150    3.409406583    3.581997091    4.073438302
    2.479131886    3.478665822    3.668142111    4.089768938
    2.504173623    3.552529621    3.737460564    4.100526489
    2.529215359    3.625981206    3.786503889    4.105718427
    2.554257095    3.693011490    3.811164050    4.104196356
    2.579298831    3.747401981    3.808256047    4.092867111
    2.604340568    3.783509261    3.777601501    4.066799179
    2.629382304    3.797000217    3.723632887    4.020355476
    2.654424040    3.785708137    3.655509786    3.948876629
    2.679465776    3.750526508    3.585283720    3.850347812
    2.704507513    3.695729937    3.524745695    3.726773164
    2.729549249    3.628060178    3.482465615    3.584866228
    2.754590985    3.554623680    3.462312438    3.435270854
    2.779632721    3.480536058    3.463665511    3.289947001
    2.804674457    3.407535807    3.482635268    3.158700108
    2.829716194    3.334251084    3.513500032    3.046658657
    2.854757930    3.257838606    3.549948740    2.953867334
    2.879799666    3.175934297    3.586004930    2.876868561
    2.904841402    3.087796740    3.616548073    2.811295562
    2.929883139    2.994322940    3.637463532    2.754244478
    2.954924875    2.897587485    3.645745512    2.705423610
    2.979966611    2.800695580    3.639962769    2.666813535
    3.005008347    2.708016314    3.621089203    2.641352856



Here is the method I followed to perform the calculations:

First, I generated the 885 k-points grid using kpoints.x with the following
method:

     ***************************************************
     *                                                 *
     *       Welcome to the special points world!      *
     *________________________________________________ *
     *    1 = cubic p (sc )       8 = orthor p (so )    *
     *    2 = cubic f (fcc)        9 = orthor base-cent. *
     *    3 = cubic i (bcc)     10 = orthor face-cent. *
     *    4 = hex & trig p      11 = orthor body-cent. *
     *    5 = trigonal   r        12 = monoclinic  p     *
     *    6 = tetrag p (st )     13 = monocl base-cent. *
     *    7 = tetrag i (bct)     14 = triclinic   p     *
     ***************************************************

     bravais lattice  >> 4
     filout [mesh_k]  >> 885-Grid
     enter celldm(3)  >> 1.584263924
     mesh: n1 n2 n3   >> 8 8 5
     mesh: k1 k2 k3 (0 no shift, 1 shifted) >> 0 0 0
     write all k? [f] >> y

     # of k-points   ==   320  of   320



Then, I performed the SCF calculation, considering the input file provided
below.

Afterward, I extracted the dielectric function using epsilon.x, considering
the input file provided below.



- The input file of SCF calculation:

 &CONTROL
                 calculation = 'scf' ,
                      outdir = './out/' ,
                  pseudo_dir = './pseudo/' ,
                      prefix = 'Wurtzite-ZnO' ,
                   verbosity = 'high' ,
 /
 &SYSTEM
                          ibrav = 4,
                   celldm(1) = 6.020018068,
                   celldm(3) = 1.584263924,
                             nat = 4,
                           ntyp = 2,
                      ecutwfc = 60 ,
                      ecutrho = 720 ,
                          nbnd = 40,
                       nosym = .true. ,
                         noinv = .true. ,
               occupations = 'fixed' ,
 /
 &ELECTRONS
                    conv_thr = 1.d-8 ,
 /
 &IONS
 /
 &CELL
 /
ATOMIC_SPECIES
   Zn   65.38  Zn.pw-mt_fhi.UPF
   O    15.999 O.pw-mt_fhi.UPF
ATOMIC_POSITIONS crystal
Zn            0.3333333330        0.6666666660        0.0016434277
O             0.3333333330        0.6666666660        0.3800565723
Zn            0.6666666660        0.3333333330        0.5016434277
O             0.6666666660        0.3333333330        0.8800565723
K_POINTS crystal
  320
    0.0000000  0.0000000  0.0000000  1.0
    0.1250000  0.0721688  0.0000000  1.0
    0.2500000  0.1443376  0.0000000  1.0
    0.3750000  0.2165064  0.0000000  1.0
    0.5000000  0.2886751  0.0000000  1.0
    0.6250000  0.3608439  0.0000000  1.0
    0.7500000  0.4330127  0.0000000  1.0
    0.8750000  0.5051815  0.0000000  1.0
    0.0000000  0.1443376  0.0000000  1.0
    0.1250000  0.2165064  0.0000000  1.0
    0.2500000  0.2886751  0.0000000  1.0
    0.3750000  0.3608439  0.0000000  1.0
    0.5000000  0.4330127  0.0000000  1.0
    0.6250000  0.5051815  0.0000000  1.0
    0.7500000  0.5773503  0.0000000  1.0
    0.8750000  0.6495191  0.0000000  1.0
    0.0000000  0.2886751  0.0000000  1.0
    0.1250000  0.3608439  0.0000000  1.0
    0.2500000  0.4330127  0.0000000  1.0
    0.3750000  0.5051815  0.0000000  1.0
    0.5000000  0.5773503  0.0000000  1.0
    0.6250000  0.6495191  0.0000000  1.0
    0.7500000  0.7216878  0.0000000  1.0
    0.8750000  0.7938566  0.0000000  1.0
    0.0000000  0.4330127  0.0000000  1.0
    0.1250000  0.5051815  0.0000000  1.0
    0.2500000  0.5773503  0.0000000  1.0
    0.3750000  0.6495191  0.0000000  1.0
    0.5000000  0.7216878  0.0000000  1.0
    0.6250000  0.7938566  0.0000000  1.0
    0.7500000  0.8660254  0.0000000  1.0
    0.8750000  0.9381942  0.0000000  1.0
    0.0000000  0.5773503  0.0000000  1.0
    0.1250000  0.6495191  0.0000000  1.0
    0.2500000  0.7216878  0.0000000  1.0
    0.3750000  0.7938566  0.0000000  1.0
    0.5000000  0.8660254  0.0000000  1.0
    0.6250000  0.9381942  0.0000000  1.0
    0.7500000  1.0103630  0.0000000  1.0
    0.8750000  1.0825318  0.0000000  1.0
    0.0000000  0.7216878  0.0000000  1.0
    0.1250000  0.7938566  0.0000000  1.0
    0.2500000  0.8660254  0.0000000  1.0
    0.3750000  0.9381942  0.0000000  1.0
    0.5000000  1.0103630  0.0000000  1.0
    0.6250000  1.0825318  0.0000000  1.0
    0.7500000  1.1547005  0.0000000  1.0
    0.8750000  1.2268693  0.0000000  1.0
    0.0000000  0.8660254  0.0000000  1.0
    0.1250000  0.9381942  0.0000000  1.0
    0.2500000  1.0103630  0.0000000  1.0
    0.3750000  1.0825318  0.0000000  1.0
    0.5000000  1.1547005  0.0000000  1.0
    0.6250000  1.2268693  0.0000000  1.0
    0.7500000  1.2990381  0.0000000  1.0
    0.8750000  1.3712069  0.0000000  1.0
    0.0000000  1.0103630  0.0000000  1.0
    0.1250000  1.0825318  0.0000000  1.0
    0.2500000  1.1547005  0.0000000  1.0
    0.3750000  1.2268693  0.0000000  1.0
    0.5000000  1.2990381  0.0000000  1.0
    0.6250000  1.3712069  0.0000000  1.0
    0.7500000  1.4433757  0.0000000  1.0
    0.8750000  1.5155445  0.0000000  1.0
    0.0000000  0.0000000  0.1262416  1.0
    0.1250000  0.0721688  0.1262416  1.0
    0.2500000  0.1443376  0.1262416  1.0
    0.3750000  0.2165064  0.1262416  1.0
    0.5000000  0.2886751  0.1262416  1.0
    0.6250000  0.3608439  0.1262416  1.0
    0.7500000  0.4330127  0.1262416  1.0
    0.8750000  0.5051815  0.1262416  1.0
    0.0000000  0.1443376  0.1262416  1.0
    0.1250000  0.2165064  0.1262416  1.0
    0.2500000  0.2886751  0.1262416  1.0
    0.3750000  0.3608439  0.1262416  1.0
    0.5000000  0.4330127  0.1262416  1.0
    0.6250000  0.5051815  0.1262416  1.0
    0.7500000  0.5773503  0.1262416  1.0
    0.8750000  0.6495191  0.1262416  1.0
    0.0000000  0.2886751  0.1262416  1.0
    0.1250000  0.3608439  0.1262416  1.0
    0.2500000  0.4330127  0.1262416  1.0
    0.3750000  0.5051815  0.1262416  1.0
    0.5000000  0.5773503  0.1262416  1.0
    0.6250000  0.6495191  0.1262416  1.0
    0.7500000  0.7216878  0.1262416  1.0
    0.8750000  0.7938566  0.1262416  1.0
    0.0000000  0.4330127  0.1262416  1.0
    0.1250000  0.5051815  0.1262416  1.0
    0.2500000  0.5773503  0.1262416  1.0
    0.3750000  0.6495191  0.1262416  1.0
    0.5000000  0.7216878  0.1262416  1.0
    0.6250000  0.7938566  0.1262416  1.0
    0.7500000  0.8660254  0.1262416  1.0
    0.8750000  0.9381942  0.1262416  1.0
    0.0000000  0.5773503  0.1262416  1.0
    0.1250000  0.6495191  0.1262416  1.0
    0.2500000  0.7216878  0.1262416  1.0
    0.3750000  0.7938566  0.1262416  1.0
    0.5000000  0.8660254  0.1262416  1.0
    0.6250000  0.9381942  0.1262416  1.0
    0.7500000  1.0103630  0.1262416  1.0
    0.8750000  1.0825318  0.1262416  1.0
    0.0000000  0.7216878  0.1262416  1.0
    0.1250000  0.7938566  0.1262416  1.0
    0.2500000  0.8660254  0.1262416  1.0
    0.3750000  0.9381942  0.1262416  1.0
    0.5000000  1.0103630  0.1262416  1.0
    0.6250000  1.0825318  0.1262416  1.0
    0.7500000  1.1547005  0.1262416  1.0
    0.8750000  1.2268693  0.1262416  1.0
    0.0000000  0.8660254  0.1262416  1.0
    0.1250000  0.9381942  0.1262416  1.0
    0.2500000  1.0103630  0.1262416  1.0
    0.3750000  1.0825318  0.1262416  1.0
    0.5000000  1.1547005  0.1262416  1.0
    0.6250000  1.2268693  0.1262416  1.0
    0.7500000  1.2990381  0.1262416  1.0
    0.8750000  1.3712069  0.1262416  1.0
    0.0000000  1.0103630  0.1262416  1.0
    0.1250000  1.0825318  0.1262416  1.0
    0.2500000  1.1547005  0.1262416  1.0
    0.3750000  1.2268693  0.1262416  1.0
    0.5000000  1.2990381  0.1262416  1.0
    0.6250000  1.3712069  0.1262416  1.0
    0.7500000  1.4433757  0.1262416  1.0
    0.8750000  1.5155445  0.1262416  1.0
    0.0000000  0.0000000  0.2524832  1.0
    0.1250000  0.0721688  0.2524832  1.0
    0.2500000  0.1443376  0.2524832  1.0
    0.3750000  0.2165064  0.2524832  1.0
    0.5000000  0.2886751  0.2524832  1.0
    0.6250000  0.3608439  0.2524832  1.0
    0.7500000  0.4330127  0.2524832  1.0
    0.8750000  0.5051815  0.2524832  1.0
    0.0000000  0.1443376  0.2524832  1.0
    0.1250000  0.2165064  0.2524832  1.0
    0.2500000  0.2886751  0.2524832  1.0
    0.3750000  0.3608439  0.2524832  1.0
    0.5000000  0.4330127  0.2524832  1.0
    0.6250000  0.5051815  0.2524832  1.0
    0.7500000  0.5773503  0.2524832  1.0
    0.8750000  0.6495191  0.2524832  1.0
    0.0000000  0.2886751  0.2524832  1.0
    0.1250000  0.3608439  0.2524832  1.0
    0.2500000  0.4330127  0.2524832  1.0
    0.3750000  0.5051815  0.2524832  1.0
    0.5000000  0.5773503  0.2524832  1.0
    0.6250000  0.6495191  0.2524832  1.0
    0.7500000  0.7216878  0.2524832  1.0
    0.8750000  0.7938566  0.2524832  1.0
    0.0000000  0.4330127  0.2524832  1.0
    0.1250000  0.5051815  0.2524832  1.0
    0.2500000  0.5773503  0.2524832  1.0
    0.3750000  0.6495191  0.2524832  1.0
    0.5000000  0.7216878  0.2524832  1.0
    0.6250000  0.7938566  0.2524832  1.0
    0.7500000  0.8660254  0.2524832  1.0
    0.8750000  0.9381942  0.2524832  1.0
    0.0000000  0.5773503  0.2524832  1.0
    0.1250000  0.6495191  0.2524832  1.0
    0.2500000  0.7216878  0.2524832  1.0
    0.3750000  0.7938566  0.2524832  1.0
    0.5000000  0.8660254  0.2524832  1.0
    0.6250000  0.9381942  0.2524832  1.0
    0.7500000  1.0103630  0.2524832  1.0
    0.8750000  1.0825318  0.2524832  1.0
    0.0000000  0.7216878  0.2524832  1.0
    0.1250000  0.7938566  0.2524832  1.0
    0.2500000  0.8660254  0.2524832  1.0
    0.3750000  0.9381942  0.2524832  1.0
    0.5000000  1.0103630  0.2524832  1.0
    0.6250000  1.0825318  0.2524832  1.0
    0.7500000  1.1547005  0.2524832  1.0
    0.8750000  1.2268693  0.2524832  1.0
    0.0000000  0.8660254  0.2524832  1.0
    0.1250000  0.9381942  0.2524832  1.0
    0.2500000  1.0103630  0.2524832  1.0
    0.3750000  1.0825318  0.2524832  1.0
    0.5000000  1.1547005  0.2524832  1.0
    0.6250000  1.2268693  0.2524832  1.0
    0.7500000  1.2990381  0.2524832  1.0
    0.8750000  1.3712069  0.2524832  1.0
    0.0000000  1.0103630  0.2524832  1.0
    0.1250000  1.0825318  0.2524832  1.0
    0.2500000  1.1547005  0.2524832  1.0
    0.3750000  1.2268693  0.2524832  1.0
    0.5000000  1.2990381  0.2524832  1.0
    0.6250000  1.3712069  0.2524832  1.0
    0.7500000  1.4433757  0.2524832  1.0
    0.8750000  1.5155445  0.2524832  1.0
    0.0000000  0.0000000  0.3787248  1.0
    0.1250000  0.0721688  0.3787248  1.0
    0.2500000  0.1443376  0.3787248  1.0
    0.3750000  0.2165064  0.3787248  1.0
    0.5000000  0.2886751  0.3787248  1.0
    0.6250000  0.3608439  0.3787248  1.0
    0.7500000  0.4330127  0.3787248  1.0
    0.8750000  0.5051815  0.3787248  1.0
    0.0000000  0.1443376  0.3787248  1.0
    0.1250000  0.2165064  0.3787248  1.0
    0.2500000  0.2886751  0.3787248  1.0
    0.3750000  0.3608439  0.3787248  1.0
    0.5000000  0.4330127  0.3787248  1.0
    0.6250000  0.5051815  0.3787248  1.0
    0.7500000  0.5773503  0.3787248  1.0
    0.8750000  0.6495191  0.3787248  1.0
    0.0000000  0.2886751  0.3787248  1.0
    0.1250000  0.3608439  0.3787248  1.0
    0.2500000  0.4330127  0.3787248  1.0
    0.3750000  0.5051815  0.3787248  1.0
    0.5000000  0.5773503  0.3787248  1.0
    0.6250000  0.6495191  0.3787248  1.0
    0.7500000  0.7216878  0.3787248  1.0
    0.8750000  0.7938566  0.3787248  1.0
    0.0000000  0.4330127  0.3787248  1.0
    0.1250000  0.5051815  0.3787248  1.0
    0.2500000  0.5773503  0.3787248  1.0
    0.3750000  0.6495191  0.3787248  1.0
    0.5000000  0.7216878  0.3787248  1.0
    0.6250000  0.7938566  0.3787248  1.0
    0.7500000  0.8660254  0.3787248  1.0
    0.8750000  0.9381942  0.3787248  1.0
    0.0000000  0.5773503  0.3787248  1.0
    0.1250000  0.6495191  0.3787248  1.0
    0.2500000  0.7216878  0.3787248  1.0
    0.3750000  0.7938566  0.3787248  1.0
    0.5000000  0.8660254  0.3787248  1.0
    0.6250000  0.9381942  0.3787248  1.0
    0.7500000  1.0103630  0.3787248  1.0
    0.8750000  1.0825318  0.3787248  1.0
    0.0000000  0.7216878  0.3787248  1.0
    0.1250000  0.7938566  0.3787248  1.0
    0.2500000  0.8660254  0.3787248  1.0
    0.3750000  0.9381942  0.3787248  1.0
    0.5000000  1.0103630  0.3787248  1.0
    0.6250000  1.0825318  0.3787248  1.0
    0.7500000  1.1547005  0.3787248  1.0
    0.8750000  1.2268693  0.3787248  1.0
    0.0000000  0.8660254  0.3787248  1.0
    0.1250000  0.9381942  0.3787248  1.0
    0.2500000  1.0103630  0.3787248  1.0
    0.3750000  1.0825318  0.3787248  1.0
    0.5000000  1.1547005  0.3787248  1.0
    0.6250000  1.2268693  0.3787248  1.0
    0.7500000  1.2990381  0.3787248  1.0
    0.8750000  1.3712069  0.3787248  1.0
    0.0000000  1.0103630  0.3787248  1.0
    0.1250000  1.0825318  0.3787248  1.0
    0.2500000  1.1547005  0.3787248  1.0
    0.3750000  1.2268693  0.3787248  1.0
    0.5000000  1.2990381  0.3787248  1.0
    0.6250000  1.3712069  0.3787248  1.0
    0.7500000  1.4433757  0.3787248  1.0
    0.8750000  1.5155445  0.3787248  1.0
    0.0000000  0.0000000  0.5049664  1.0
    0.1250000  0.0721688  0.5049664  1.0
    0.2500000  0.1443376  0.5049664  1.0
    0.3750000  0.2165064  0.5049664  1.0
    0.5000000  0.2886751  0.5049664  1.0
    0.6250000  0.3608439  0.5049664  1.0
    0.7500000  0.4330127  0.5049664  1.0
    0.8750000  0.5051815  0.5049664  1.0
    0.0000000  0.1443376  0.5049664  1.0
    0.1250000  0.2165064  0.5049664  1.0
    0.2500000  0.2886751  0.5049664  1.0
    0.3750000  0.3608439  0.5049664  1.0
    0.5000000  0.4330127  0.5049664  1.0
    0.6250000  0.5051815  0.5049664  1.0
    0.7500000  0.5773503  0.5049664  1.0
    0.8750000  0.6495191  0.5049664  1.0
    0.0000000  0.2886751  0.5049664  1.0
    0.1250000  0.3608439  0.5049664  1.0
    0.2500000  0.4330127  0.5049664  1.0
    0.3750000  0.5051815  0.5049664  1.0
    0.5000000  0.5773503  0.5049664  1.0
    0.6250000  0.6495191  0.5049664  1.0
    0.7500000  0.7216878  0.5049664  1.0
    0.8750000  0.7938566  0.5049664  1.0
    0.0000000  0.4330127  0.5049664  1.0
    0.1250000  0.5051815  0.5049664  1.0
    0.2500000  0.5773503  0.5049664  1.0
    0.3750000  0.6495191  0.5049664  1.0
    0.5000000  0.7216878  0.5049664  1.0
    0.6250000  0.7938566  0.5049664  1.0
    0.7500000  0.8660254  0.5049664  1.0
    0.8750000  0.9381942  0.5049664  1.0
    0.0000000  0.5773503  0.5049664  1.0
    0.1250000  0.6495191  0.5049664  1.0
    0.2500000  0.7216878  0.5049664  1.0
    0.3750000  0.7938566  0.5049664  1.0
    0.5000000  0.8660254  0.5049664  1.0
    0.6250000  0.9381942  0.5049664  1.0
    0.7500000  1.0103630  0.5049664  1.0
    0.8750000  1.0825318  0.5049664  1.0
    0.0000000  0.7216878  0.5049664  1.0
    0.1250000  0.7938566  0.5049664  1.0
    0.2500000  0.8660254  0.5049664  1.0
    0.3750000  0.9381942  0.5049664  1.0
    0.5000000  1.0103630  0.5049664  1.0
    0.6250000  1.0825318  0.5049664  1.0
    0.7500000  1.1547005  0.5049664  1.0
    0.8750000  1.2268693  0.5049664  1.0
    0.0000000  0.8660254  0.5049664  1.0
    0.1250000  0.9381942  0.5049664  1.0
    0.2500000  1.0103630  0.5049664  1.0
    0.3750000  1.0825318  0.5049664  1.0
    0.5000000  1.1547005  0.5049664  1.0
    0.6250000  1.2268693  0.5049664  1.0
    0.7500000  1.2990381  0.5049664  1.0
    0.8750000  1.3712069  0.5049664  1.0
    0.0000000  1.0103630  0.5049664  1.0
    0.1250000  1.0825318  0.5049664  1.0
    0.2500000  1.1547005  0.5049664  1.0
    0.3750000  1.2268693  0.5049664  1.0
    0.5000000  1.2990381  0.5049664  1.0
    0.6250000  1.3712069  0.5049664  1.0
    0.7500000  1.4433757  0.5049664  1.0
    0.8750000  1.5155445  0.5049664  1.0



- The input file to extract the dielectric function:

&INPUTPP
             calculation = 'eps' ,
                     prefix = 'Wurtzite-ZnO' ,
                     outdir = './out/' ,
/
&ENERGY_GRID
               smeartype = 'gauss' ,
              intersmear = 0.4
              intrasmear = 0.0
                       wmin = 0.0
                      wmax = 15.0
                           nw = 600
                         shift = 0.0
/



Could you please clarify the possible reasons for these disturbances? Is
there anything incorrect in the way I conducted the calculations?
Additionally, why does the grid along the x-axis differ from the y-axis in
the generated k-points using kpoints.x?

Thank you for your time and assistance. I appreciate your insights.

Best regards.




--
L. Ait Lamine
PhD student
Polydisciplinary Faculty of Ouarzazate, Ibnou Zohr University
Ouarzazate, Morocco
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