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[apirath@hpcc.nectec.or.th]

Dear all,

I have calculated the electronic structure of BiSbTe compound with the
spin-orbit interaction, and I have a question about the spin degeneracy.
In calculating the spin-orbit coupling, the wave function is two component
spinor (nspinor = 2), and the number of eigenvalues is doubled. Although
the eigenvalues are separated for the spin up and spin down components,
they are still 2-fold spin degeneracy. As in the tutorial, the p-level is
split, but each level has two equal eigenenergies.
However, I found that in my calculation the spin degeneracy was lifted. I
was wondering that if it's ok to have spin degeneracy lifted when taking
the spin-orbit into account? or I did something wrong?

Best regards,
Apirath