[Wien] why we need to divide plasma frequency by root(2)?

[Dr. K. C. Bhamu]

This is in continuation to my previous email about -sp+-so (final answer on
that email is still needed).


meanwhile, I have calculated plasma frequency for a metal case and I got
below (case is -sp+-so):


   Plasma frequencies:

   !!! WARNING: w_pl = sqrt( w_pl^2(up-spin) + w_pl^2(dn-spin) )!!!

       w_p_xx      w_p_yy      w_p_zz    [eV]

       2.0740      2.0740      1.2640

So the format of my case.inkram should be
---------------------case.injoint
xx
xx
xx
2.0740      2.0740      1.2640
xx
-----------------------------------

were xx means no change in lines of case.inkram.



At page numer  164 under section "8.11 KRAM (Kramers-Kronig transformation)
in UG"


*"For a metal, the Plasma-frequencies (intraband transitions) for up and dn
should be added, but then divided by√2, before using x kram." *

Does it mean that we need to add all three components and then divide by
root(2) and put a single number [(2.074+2.074+1.264)/root(2)=3.88] instead
of all three in case.injoint?


kind regards

Bhamu
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