Hi I just<br>
stared to use PWSCF and I have a problem to calculate the band structure of an hexagonal BN sheet<br>
It seems that the conduction states do not converge, any hints?<br>
This are my input files:<br>
<br>
<br>
**************** BN SCF ****************<br>
&control<br>
calculation = 'scf'<br>
restart_mode='from_scratch',<br>
prefix='hbn',<br>
pseudo_dir = '/home/attacc/espresso-3.1.1/pseudo/',<br>
outdir='/home/attacc/tmp/'<br>
/<br>
&system<br>
ibrav= 4<br>
celldm(1) = 4.7177372151<br>
celldm(3) = 10<br>
nat= 2<br>
ntyp= 2<br>
ecutwfc =25.0,<br>
/<br>
&electrons<br>
diagonalization='cg'<br>
mixing_mode = 'plain'<br>
mixing_beta = 0.7<br>
conv_thr = 1.0d-8<br>
/<br>
ATOMIC_SPECIES<br>
B 10.811 B.pz-vbc.UPF<br>
N 14.00674 N.pz-vbc.UPF<br>
ATOMIC_POSITIONS crystal<br>
B 0 0 0<br>
N 0.333333333333333 0.66666666666666666 0<br>
K_POINTS automatic<br>
6 6 1 0 0 0<br>
*****************************************************<br>
<br>
********************* BN bands ******************<br>
&control<br>
calculation='nscf'<br>
pseudo_dir = '/home/attacc/espresso-3.1.1/pseudo/',<br>
outdir='/home/attacc/tmp/',<br>
prefix='hbn'<br>
verbosity = 'high'<br>
/<br>
&system<br>
ibrav= 4<br>
celldm(1) = 4.7177372151<br>
celldm(3) = 10<br>
nat= 2<br>
ntyp= 2<br>
ecutwfc =25.0,<br>
nbnd = 8<br>
/<br>
&electrons<br>
diago_full_acc = .TRUE.<br>
/<br>
ATOMIC_SPECIES<br>
B 10.811 B.pz-vbc.UPF<br>
N 14.00674 N.pz-vbc.UPF<br>
ATOMIC_POSITIONS crystal<br>
B 0 0 0<br>
N 0.333333333333333 0.66666666666666666 0<br>
K_POINTS<br>
25<br>
0 0 0 1<br>
.0333333333 .0333333333 0 1<br>
.0666666666 .0666666666 0 1<br>
.0999999999 .0999999999 0 1<br>
.1333333332 .1333333332 0 1<br>
.1666666665 .1666666665 0 1<br>
.1999999998 .1999999998 0 1<br>
.2333333331 .2333333331 0 1<br>
.2666666664 .2666666664 0 1<br>
.2999999997 .2999999997 0 1<br>
.3333333330 .3333333330 0 1<br>
.277777777 .361111111 0 1<br>
.222222222 .388888888 0 1<br>
.166666666 .416666666 0 1<br>
.111111111 .444444444 0 1<br>
.055555555 .472222222 0 1<br>
0
0.5 0 1<br>
0 .4375000000 0 1<br>
0 .3750000000 0 1<br>
0 .3125000000 0 1<br>
0 .2500000000 0 1<br>
0 .1875000000 0 1<br>
0 .1250000000 0 1<br>
0 .0625000000 0 1<br>
0 0 0 1<br>
<br>Thanks in advance<br>
Claudio<br>
<br>
<br>==========================================================<br>Claudio Attaccalite<br><br>Institute for Electronics, Microelectronics, and Nanotechnology<br>Dept. ISEN<br>B.P. 60069<br>59652 Villeneuve d'Ascq Cedex France
<br>Skype: claudioattaccalite<br>web site: <a href="http://www.attaccalite.altervista.org">www.attaccalite.altervista.org</a><br>===========================================================<br><br>Freely download scientific books from:
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