[Wannier] band structure interpolation ends up with wiggly bands

[Yu Zhang]

Dear wannier90 users and developers,

I am using wannier90-1.2 and vasp5.3 to obtain the wannier wave function of
gold with spin-orbital coupling. I used d5s orbital as target. However, it
ends up with some wiggly bands as shown by the attached figure. I have
tried different projection (d5), and k-mesh, but I still failed to get the
smooth bands. Does anyone know what causes the wiggly bands and how to get
rid of them?


My wannier90 input file is:
===========================================
num_wann  = 12  ! set to NBANDS by VASP
num_bands = 12

exclude_bands : 1-2, 15-16

spinors = .true.
Begin Projections
Au: l=0;l=2
End Projections

begin unit_cell_cart
     0.0000000     2.0340000     2.0340000
     2.0340000     0.0000000     2.0340000
     2.0340000     2.0340000     0.0000000
end unit_cell_cart

begin atoms_cart
Au       0.0000000     0.0000000     0.0000000
end atoms_cart

mp_grid =    21    21    21

begin kpoints
      0.000000000000      0.000000000000      0.000000000000
      0.047619047619      0.000000000000      0.000000000000
      0.095238095238      0.000000000000      0.000000000000
      0.142857142857      0.000000000000      0.000000000000
      0.190476190476      0.000000000000      0.000000000000
.......
==================================================

Thank you very much in advance!

Best regards,

Yu Zhang
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