Ok.
Next, you must look into the generated files.

case.output1up/dn      are there eigenvalues listed ?
case.scf2up/dn         Ef and band ranges listed ?
case.outputopup/dn     any errors, NaN, ...
$SCRATCH/case.symmaup/dn     non-zero matrix elements ?
case.jointup/dn at energies above the gap some non-zero values should be listed
case.joint             as above

Regards

Am 22.03.2024 um 12:14 schrieb Hamza BFA:
Dear Prof. P. Blaha,
emax =2.5 Ry was chosen
3000 Kpoints
here are the steps followed
emax =2.5 Ry was chosen
x lapw1 -up/dn -p
x lapw2 -fermi -up/dn -p
x optic -up/dn -p
x joint  -up/dn -p
adjoint-updan (YPdAs.joint has been created adding up+dn)
x kram
Sincerely

Le ven. 22 mars 2024 à 02:01, Hamza BFA <hamza....@gmail.com <mailto:hamza....@gmail.com>> a écrit :

    Hi,
    after an optical calculation of a narrow gap semiconductor with
    PBEsol functional, I obtained a zero imaginary part and a constant
    real part (equal to 1) of the dielectric function.
    More details :
    23.2 version
    init -prec 2 -numk 1500 -nohdlo -sp -b
    runsp -p -ec 0.00001
    input files are in attachment
    Do you have a solution to this problem.?
    Sincerely
    #########################################YPdAs.epsilon
    #
    # Lorentzian broadening with gamma= 0.100000  [eV]
    # Im(epsilon) shifted by   0.0000   [eV]
    # No intraband contributions added
    #
    # Energy [eV] Re_eps_xx     Im_eps_xx     Re_eps_zz     Im_eps_zz
    #
        0.013610  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
        0.040820  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
        0.068030  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
        0.095240  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
        0.122450  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
        0.149660  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
        0.176870  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
        0.204090  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
    .....
    .....
    13.265560  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.292770  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.319980  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.347190  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.374400  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.401610  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.428820  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.456030  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.483250  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.510460  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.537670  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00
       13.564880  0.100000E+01  0.000000E+00  0.100000E+01  0.000000E+00


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