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<body class='hmmessage'><div dir='ltr'>Hi,<br><br>In general, you have to take the corrected average electrostatic potential at the vacuum level with the dipole layer correction. <br>What's relevant is to report please the workfunction value you get for Ni(111). If you have converged all the your input parameters you should get something close to the workfunction experimental value which is around 5.1-5.3 eV<br><br>Could you please report the workfunction value for Ni(111)?<br><br>1) without mixing_mode and without dipole layer correction?<br>2) with mixing_mode and without dipole layer correction?<br><br>Best regards,<br>Ali Kachmar<br><div><div id="SkyDrivePlaceholder"></div><hr id="stopSpelling">Date: Sat, 13 Apr 2013 17:45:07 +0530<br>From: niharikaj@students.iiserpune.ac.in<br>To: pw_forum@pwscf.org<br>Subject: [Pw_forum] Two vacuum energies with dipole correction<br><br>Hello,<br>I need to calculate the work function of Ni(111) slab. <br><br>So I am doing the calculations by including the dipole correction so as to identify the vacuum level .<br>Please find the input file at the end.<br><br>
But with the correction I see a step in the vacuum region in the electrostatic potential plot of around 0.2 eV <br>and I am unable to decide which of the two vacuum energies should I use to calculate the work function and why. <br clear="all">
<br><br>&control<br> calculation = 'relax'<br> prefix='Ni-dipcorr',<br> tprnfor = .true.<br> pseudo_dir = '.',<br> outdir='.'<br> wf_collect=.true.<br> tefield=.true.<br>
dipfield=.true.<br><br> /<br> &system<br> ibrav= 0,<br> nat= 6, ntyp= 1,<br> ecutwfc =35<br> ecutrho =360,<br> occupations='smearing',<br> smearing='mv',<br> degauss=0.01,<br>
nspin=2<br> starting_magnetization(1)=1.0<br> emaxpos=0.6<br> eopreg=0.05<br> eamp=0<br> edir=3<br>/<br>&electrons<br> conv_thr = 1.0d-8<br> mixing_beta = 0.2<br> mixing_mode='local-TF'<br>
<br>/<br>&IONS<br>/<br>ATOMIC_SPECIES<br> Ni 58.6931 Ni.pbe-nd-rrkjus.UPF<br>ATOMIC_POSITIONS (angstrom)<br>Ni 0.000000000 0.000000000 0.000000000 0 0 0<br>Ni 2.779543930 -0.744776550 2.034767380 0 0 0<br>
Ni 1.389771960 -0.372388280 4.069534750 0 0 0<br>Ni 0.000000000 0.000000000 6.100912698<br>Ni 2.779543930 -0.744776550 8.127474042<br>Ni 1.389771889 -0.372388192 10.129931733<br>
<br>K_POINTS {automatic}<br> 12 12 1 1 1 1<br>CELL_PARAMETERS {hexagonal}<br> 3.330000000 -3.330000000 0.00000000<br> 4.54886459 1.218864589 0.00000000<br> 0.0000000000 0.0000000000 50.0<br><br>Regards, <br>
Niharika Joshi<br><span style="color:rgb(192,192,192);">Project student,<br>Department of Physics, </span><br style="color:rgb(192,192,192);"><span style="color:rgb(192,192,192);">IISER, </span><span style="color:rgb(192,192,192);">Pune,<br>
India.<br><br></span>
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