[Wannier] Error: too many projections specified without selecting a subset

[Rishab Sahoo]

Dear Wannier90 community,
I am running Wannier90 calculation for a 2D Carbon allotrope with *12 atoms*
in a unit cell, using *C: s and C: p projections* but I am getting the
error-
*".amn file has too many projections specified without selecting a subset"*
indicating that the no. of projections I have specified in projections
block doesn't match with the no. of wannier orbitals mentioned. Using only
sp2 in projections block doesn't work either.

A similar issue has previously been raised on the forum where the issue was
resolved upon using only *"random projections"* and I did the same, which
worked out for me. The hybridization as determined in previous literature
is sp2 which should give atom-centered orbitals, but using random
projections gives me bond-centered orbitals upon visualization. I wish to
do the Wannier interpolation using the s and p orbital projections.

In my case, the bands given by C:s and C:p are entangled, and therefore I
am unable to set a frozen window that includes only the sp2 orbitals (while
excluding pz orbital). I have also tried wannierizing by taking all the
bands given by C:s and C:p, i.e 12 (atoms) * (3 C:p + 1 C:s) = 12*4 = 48
bands, but the orbital spread values are not within reasonable accuracy.

I have tried another way too, by giving (random + C:sp2) and (random + C:s
+ C:p) in the projections block but that gives the same error of too many
projections.
What changes should I make to the input so as to get the sp2 hybridized
orbitals?

The plots required for reference can be found in Wannier_error_files
<https://drive.google.com/drive/folders/1s8SREOnPZL4ibgjo09YKLc1IUtAMDXHx?usp=sharing>
OR
the direct drive link:
https://drive.google.com/drive/folders/1s8SREOnPZL4ibgjo09YKLc1IUtAMDXHx?usp=drive_link

The input file used is as follows:
---------------------------------------------------------------------------------------------------------------------------
begin projections
random
end projections

guiding_centres=.true.

num_bands = 26
num_wann =  26
exclude_bands = 1, 28-36

bands_plot = true
bands_plot_format = gnuplot
wannier_plot = true
iprint = 2

dis_num_iter =  500
dis_mix_ratio = 0.5
dis_win_max     = 2.1
dis_win_min     = -23
dis_froz_max    = -1.9
dis_froz_min    = -23
!dis_conv_tol = 1.0d-13
num_iter  =  2000

write_u_matrices = .true.
write_xyz=.true.

---------------------------------------------------------------------------------------------------------------------------

Thanks and regards,

*Rishab Sahoo*
Fifth-Year Undergraduate
Dept. of Metallurgical and Materials Engineering

IIT Kharagpur
<http://www.iitkgp.ac.in/>Mob: +91 6371104273
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