<div>Hi Nicholas,</div>
<div>thanks for your reply, but to my understaning, the 0.625eV fermi energy is wrong, it should be between -5~-4eV, I don't know why the code give such a fermi energy.....<br><br> </div>
<div><span class="gmail_quote">On 1/10/08, <b class="gmail_sendername">Nicholas E. Singh-Miller</b> <<a href="mailto:nedward@mit.edu">nedward@mit.edu</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Dear Zhu Xi,<br><br>I have not run your input file, but assuming that it is correct and this<br>0.625eV is what you read directly from the output, this Fermi energy
<br>should also be correct. If you are interested in the work function of<br>the (3,3)CNT you will have to obtain the difference between a vacuum<br>potential and the Fermi energy. In short the potential in the vacuum != 0
<br>due to the use of periodic boundary conditions. If you use pp.x to<br>obtain the potential remember that is is output in Rydbergs. This is all<br>discussed other times on the forum.<br><br>best of luck,<br><br>Nicholas
<br><br>On Thu, 10 Jan 2008, Zhu Xi wrote:<br><br>> Dear users,<br>><br>> I run a scf calculation of (3,3)CNT, but the fermi energy is 0.652eV, can<br>> anyone give some suggestion? thanks<br>><br>> ====================================================================================
<br>><br>> &control<br>> calculation='scf',<br>> PSEUDO_DIR='./',<br>> prefix='33',<br>> forc_conv_thr=1.0D-4,<br>> /<br>> &SYSTEM<br>
> ibrav = 0,<br>> celldm(1)= 18.8972612499,<br>> nat = 12,<br>> ntyp = 1,<br>> ecutwfc = 40.0 ,<br>> nosym = .true. ,<br>> nbnd = 48 ,<br>> occupations= 'smearing',degauss =
0.001<br>><br>> /<br>> &electrons<br>> conv_thr = 1.D-6,<br>> mixing_beta = 0.5D0,<br>> /<br>> CELL_PARAMETERS<br>> 1.0 0.000000000 0.000000000<br>> 0.000000000
1.0 0.000000000<br>> 0.000000000 0.000000000 0.245951<br>> ATOMIC_SPECIES<br>> C 12.00000 C.pz-vbc.UPF<br>> ATOMIC_POSITIONS (crystal)<br>> C 0.625289967 0.669611155 0.250000000
<br>> C 0.487077242 0.709466388 0.250000000<br>> C 0.291384631 0.523168925 0.250000000<br>> C 0.374710033 0.330388845 0.750000000<br>> C 0.512922758 0.290533612 0.750000000
<br>> C 0.708615369 0.476831075 0.750000000<br>> C 0.416429985 0.692001578 0.750000000<br>> C 0.675464001 0.616817067 0.750000000<br>> C 0.312292454 0.592869751 0.750000000
<br>> C 0.583570015 0.307998422 0.250000000<br>> C 0.324535999 0.383182933 0.250000000<br>> C 0.687707546 0.407130249 0.250000000<br>> K_POINTS automatic<br>> 1 1 11 0 0 0<br>
><br>> ==================================================<br>><br><br>*****************************************<br>Nicholas E. Singh-Miller<br>Ph.D. Candidate<br>Prof. Marzari Group (<a href="http://quasiamore.mit.edu">
quasiamore.mit.edu</a>)<br>Materials Science and Engineering<br>Massachusetts Institute of Technology<br>13-4066<br>(617)324-0372<br>*****************************************<br>_______________________________________________
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</div><br><br clear="all"><br>-- <br>X