<div>Hi.</div>
<div> I tried to calculation anatase tio2 wannier center with wannier, but came to several failures with different error complains.</div>
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<div>one question is about kmesh setting:</div>
<div> when i use 3x3x3 (or 4x4x2) mp grids , wannier could generate data tio2.nnkp without complain. But when i tried another mp grids such as 4x4x4, wannier would complain " kmesh_get: something wrong, found > 12 nearest neighbours" and exit without generating
tio2.nnkp data file. would you please explain what the problem it is related to ? From mannual , i guess this error is due to kpoints' shell, but i donot follow much idea about this setting, would you please explain more about it ?
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<div>Just with(4x4x2 mp mesh) , successfully finishing pw2wannier calculation , but wannier.x calculation gave this complain: "param_read: mismatch in tita.eig" . Does it mean scf calculation is not converged or wrong parameters for
wannier.x ?</div>
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<div>another stupid question about projection setting: the setting Nicola gave for PbTiO3 in last mail is according its band's structure , and the projection functions are s/p type-like orbitals. i wanna know whether there are some guidelines for setting up initial projection functions ?
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<div>input file for tio2.win</div>
<div>
<p>num_wann = 24<br>num_iter = 400</p>
<p>begin atoms_cart<br>Ti 0.000000000 -0.946250000 -1.189250000<br>Ti 0.000000000 0.946250000 1.189250000<br>O 0.000000000 0.946250000 -0.796426921<br>O 0.000000000 -0.946250000 0.796426921
<br>O 1.892500000 0.946250000 1.582073079<br>O -1.892500000 -0.946250000 -1.582073079<br>end atoms_cart</p>
<p>begin projections<br>Ti:sp3<br>O : sp3<br>end projections</p>
<p>begin unit_cell_cart<br>bohr<br> 3.5763081161879673 -3.5763081161879673 8.9894295386987704<br> 3.5763081161879673 3.5763081161879673 8.9894295386987704<br> -3.5763081161879673 -3.5763081161879673
8.9894295386987704<br>end unit_cell_cart<br>mp_grid : 4 4 2<br> begin kpoints</p>
<p> .............<br> end kpoints</p></div>
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<div>regards,</div>
<div>hai-ping</div>
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