Dear All,<div><br></div><div>i have performed calculations on a organic molecular crystal using PW code.</div><div>doing this i reproduce correctly the band structure i found in the literature.</div><div><br></div><div>i have then used WANNIER90 code to get the <span class="Apple-style-span" style="font-family: Helvetica; color: rgb(26, 26, 24); ">Hamiltonian matrix elements (written in wannier90_hr.dat file) as i want to know the hopping parameters between different molecular sites.</span></div>
<div><font class="Apple-style-span" color="#1A1A18" face="Helvetica"><br></font></div><div>Once i plot the file wannier90_band.dat produced by WANNIER90 these bands correctly reproduce the PW bands.</div><div>Moreover the file <span class="Apple-style-span" style="font-family: Helvetica; color: rgb(26, 26, 24); ">wannier90_hr.dat file seems to contain reasonable informations<span class="Apple-style-span" style="color: rgb(0, 0, 0); font-family: arial; "><span class="Apple-style-span" style="font-family: Helvetica; color: rgb(26, 26, 24); ">.</span></span></span></div>
<div><font class="Apple-style-span" color="#1A1A18" face="Helvetica"><br></font></div><div>However in the wannier90.wout the spread of one of the Wannier functions is very large (----> 152.37216676):</div><div><div><br>
</div><div><div> Cycle: 1000</div><div> LINE --> Iteration : 1000</div><div> LINE --> Spread at initial point : 181.645172268384</div><div> LINE --> Spread at trial step : 181.645172268384</div>
<div> LINE --> Slope along search direction : -2.431285074681767E-017</div><div> LINE --> ||SD gradient||^2 : 2.434718719629064E-015</div><div> LINE --> Trial step length : 2.00000000000000</div>
<div> LINE --> Optimal parabolic step length : 3.420559126041558E-004</div><div> LINE --> Spread at predicted minimum : 181.645172268384</div><div> LINE --> CG coefficient : 0.999997853070419</div>
<div> WF centre and spread 1 ( 6.466896, 3.625330, 2.430574 ) 152.37216676</div><div> WF centre and spread 2 ( 5.485734, 9.409137, 8.702740 ) 9.81928932</div><div> WF centre and spread 3 ( 7.666070, 4.358506, 8.556600 ) 9.83226929</div>
<div> WF centre and spread 4 ( 3.155228, 4.303197, 8.509269 ) 9.62144690</div><div> Sum of centres and spreads ( 22.773929, 21.696169, 28.199184 ) 181.64517227</div><div><br></div><div> 1000 0.000E+00 0.0000000493 181.6451722684 36.56 <-- CONV</div>
<div> O_D= 142.5795768 O_OD= 0.0828030 O_TOT= 181.6451723 <-- SPRD</div><div> Delta: O_D= 0.0000000E+00 O_OD= 0.2692291E-14 O_TOT= 0.0000000E+00 <-- DLTA</div><div> ------------------------------------------------------------------------------</div>
<div><br></div><div>The 4 WFs should have more or less the same spread.</div><div><br></div><div>Attached the input file for WANNIER90 i used.</div><div><br></div><div>I have two questions:</div><div><br></div><div>1) Can i trust the output file <span class="Apple-style-span" style="font-family: Helvetica; color: rgb(26, 26, 24); ">wannier90_hr.dat in this case?</span></div>
<div><font class="Apple-style-span" color="#1A1A18" face="Helvetica"><br></font></div><div><font class="Apple-style-span" color="#1A1A18" face="Helvetica">2) How can i get a small SPREAD?</font></div><div><font class="Apple-style-span" color="#1A1A18" face="Helvetica"><br>
</font></div><div><font class="Apple-style-span" color="#1A1A18" face="Helvetica">i thank you in advance.</font></div><div><font class="Apple-style-span" color="#1A1A18" face="Helvetica"><br></font></div><div><font class="Apple-style-span" color="#1A1A18" face="Helvetica">cheers,</font></div>
<div><font class="Apple-style-span" color="#1A1A18" face="Helvetica"><br></font></div><div><font class="Apple-style-span" color="#1A1A18" face="Helvetica">Gianluca Giovannetti</font></div><div><font class="Apple-style-span" color="#1A1A18" face="Helvetica"><br>
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