Dear All,<br><br>i`m working on extracting the Wannier functions of LiV2O4.<br><span style="font-family:arial,helvetica,sans-serif"><font color="#05004F">The trigonal symmetry
splits the low-lying t_{2g} levels into one a_{1g} and two degenerate
e_{g}^pi levels, with the former slightly lower in energy and narrower
in bandwidth.</font></span> The density of states looks very simple. <br>At Fermi level there are Vanadium d bands having a bandwidth of ~ 2eV.<br>Below in energy separated from the Vanadium d bands there are bands with predominant Oxygen p bands.<br>
I can extract with no problem the Vanadium d bands using an energy window sitting at the Vanadium d bands.<br>Wannier90 bands are on top of DFT bands (i also compared mine with some known in literature).<br>As a starting point for the projection i used:<br>
<br>begin projections<br>V:dxz;dyz;dxy<br>end projections<br>Once i try to calculate Wannierfunctions for "d" and "p" orbitals i get the following error:<br><br> A_mn = <psi_m|g_n> --> S = A.A^+ --> U = S^-1/2.A<br>
In dis_project... ERROR: unitarity of initial U<br> nkp= 1<br> i= 2 j= 4<br> [u_matrix_opt.transpose(u_matrix_opt)]_ij= 0.114936 -0.050292<br> Exiting.......<br> dis_project: Error in unitarity of initial U in dis_project<br>
<br>Do you have any idea for solving it?<br>Below it is my input file.<br><br>thank you in advance.<br><br>Gianluca Giovannetti<br><br>=========================<br><br>iprint = 3<br>num_bands = 70<br>num_wann = 36<br>
<br>num_iter = 2000<br>num_print_cycles = 100<br><br>dis_win_max = 9.1<br>dis_win_min = -0.5<br><br>dis_num_iter = 200<br>dis_mix_ratio = 0.75<br><br>write_r2mn=.true.<br>hr_plot=.true.<br><br>kmesh_tol=0.00001<br>
<br>! SYSTEM<br><br>begin unit_cell_cart<br>bohr<br>7.789167066 0.0000 7.789167066<br>0.0000 7.789167066 7.789167066<br>7.789167066 7.789167066 0.0000<br>end unit_cell_cart<br><br>begin atoms_cart<br>Ang<br>V 0.000000 0.000000 0.000000<br>
V 2.060925 2.060925 0.000000<br>V 2.060925 0.000000 2.060925<br>V 0.000000 2.060925 2.060925<br>O 0.094555000 0.094555000 1.966370000<br>O 1.966370000 1.966370000 1.966370000<br>O 0.094555000 1.966370000 0.094555000<br>
O 1.966370000 0.094555000 0.094555000<br>O -0.094556000 4.027295000 2.155480000<br>O 2.155480000 -1.966370000 2.155480000<br>O -0.094556000 -1.966370000 -0.094556000<br>O 2.155480000 4.027295000 -0.094556000<br>
Li 1.030463000 5.152312000 1.030463000<br>Li 3.091388000 3.091388000 3.091388000<br>end atoms_cart<br><br>begin projections<br>V:dxz;dyz;dxy<br>O:px;py;pz<br>end projections<br><br>begin kpoint_path<br>G 0.00 0.00 0.00 X 0.00 0.50 0.50<br>
X 0.00 0.50 0.50 W 0.25 0.75 0.50<br>W 0.25 0.75 0.50 L 0.00 0.50 0.00<br>L 0.00 0.50 0.00 G 0.00 0.00 0.00<br>end kpoint_path<br>bands_plot = .true.<br><br>!To plot the WF<br>!wannier_plot = T<br>!wannier_plot_supercell = 2<br>
!wannier_plot_list = 1-12<br>!restart = plot<br><br>! KPOINTS<br><br>mp_grid : 8 8 8<br><br>begin kpoints<br>.............<br>