[Wien] Optical properties including spin-orbit

[Fred Nastos]

On November 16, 2004 04:58 am, Chukwuemeka Okoye wrote:
> Dear wien users,
>
> I am calculating the optical conductivity of bcc iron  and found that the
> absorptive part is not always positive. This means that a plot of
> Re_sigma_xx   Re_sigma_yy  Re_sigma_zz  using  file fe.absorpup has a
> negative part. I think this is strange. This is because the mathematical
> expression (per spin) for  Re_sigma_xx  etc. makes it impossible for it to
> be negative.

- What if you do not include spin-orbit?
- How negative are you talking about here.  A large portion of the
spectrum is negative, or it just a small part.  Is it negative only at
high/low energies?