<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">Dear all,</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">I am a new user. I have gathered enough information from this forum to write some codes. However i don't understand some keywords quite well. Since i am from electrical background, i need to calculate band structure properly because my goal is to find effective mass accurately which i will use for transport calculation. Here is a bfgs relaxation code for bilayer WS2 for my query purpose:</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default">&CONTROL<br> calculation = 'relax',<br> restart_mode = 'from_scratch',<br> outdir = 'G:\all_kk_QE\Quantum_Espresso\Quantum ESPRESSO 64-bit 5.1.2-mpich2\outdir',<br> prefix = 'WS2Bilayer',<br>/<br>&SYSTEM<br><br> ibrav = 0,<br><br> a = 1.8,<br><br> nat = 6,<br><br> ntyp = 2,<br><br> occupations = 'smearing',<br><br> smearing = 'methfessel-paxton',<br><br> degauss = 0.001,<br> nspin=2,<br><br> ecutwfc = 20,<br><br> ecutrho = 160,<br><br> nbnd = 30,<br> starting_magnetization=0.6, <br> <br><br>/<br><br>&ELECTRONS<br><br> conv_thr = 1.0d-5,<br><br> mixing_mode = 'plain',<br><br> mixing_beta = 0.7,<br><br> diagonalization = 'david',<br> diago_full_acc = .true.<br><br>/<br><br>&IONS <br>ion_dynamics = 'bfgs', <br>pot_extrapolation = 'second_order', <br>wfc_extrapolation = 'second_order', <br>upscale = 100, <br>/<br><br>CELL_PARAMETERS <br>1.5 0.8660254038 0.00000<br>1.5 -0.8660254038 0.00000<br>0.0000 0.00000 15.0 <br><br>ATOMIC_SPECIES<br>W 183.84 W.pbe-hgh.UPF<br>S 32.066 S.pbe-hgh.UPF<br><br>ATOMIC_POSITIONS (angstrom)<br>S 0.000000000 0.000000000 5.15<br>S 0.000000000 0.000000000 2<br>W 1.818653348 0.000000000 3.575<br>S 0.000000000 0.000000000 12.95<br>S 0.000000000 0.000000000 9.8<br>W 1.818653348 0.000000000 11.375<br><br>K_POINTS {automatic}<br>24 24 1 0 0 0<div class="gmail_default"><font face="verdana, sans-serif"><br></font></div><div class="gmail_default"><font face="verdana, sans-serif">It's a well known system. It is put here because i want to know the meaning of such inputs : </font><span style="font-family:verdana,sans-serif">occupations, smearing, </span><span style="font-family:verdana,sans-serif">degauss, </span><span style="font-family:verdana,sans-serif">mixing_mode, </span><span style="font-family:verdana,sans-serif">mixing_beta, </span><font face="verdana, sans-serif">diagonalization etc. in nutshell but yet comprehensive enough so that i can properly use the values of these inputs for a unknown system.</font></div><div class="gmail_default"><font face="verdana, sans-serif"><br></font></div></div><div class="gmail_default" style="font-family:verdana,sans-serif;display:inline">Best Regards</div> <br><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><font face="verdana, sans-serif">Abir Shadman<br></font></div><font face="verdana, sans-serif">Dept. of EEE,<span style="font-size:12.8000001907349px">BUET.</span></font></div><div><br></div></div></div></div></div></div></div>
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