[Wien] Orbital angular momentum at Fermi surface

[Peter Blaha]

I'm not the  expert of angle resolved photoemission, but I guess
it is possible to tune your energies such that you would really probe states
at X = (0,0,1). 
And such a single state DOES HAVE a nonspherical p-charge, i.e. only pz!!!
 
In "normal" calculations we sum over the whole BZ and thus the sum of (0,0,1)
+(0,1,0)+(1,0,0) gives exactly a spherical p.

> As a simple example: If you excite an s electron (spherical) with linearly 
> polarized photons then youre final state is a p-electron aligned along the 
> axis of the electric field vector. As px, py and pz are equally distributed 
> in the final state band of the fcc lattice, you see just the allignment of 
> youre polarization, that selects which partial wave it likes to have.


                                      P.Blaha
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Peter BLAHA, Inst.f. Materials Chemistry, TU Vienna, A-1060 Vienna
Phone: +43-1-58801-15671             FAX: +43-1-58801-15698
Email: blaha at theochem.tuwien.ac.at    WWW: http://info.tuwien.ac.at/theochem/
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