Yambo Community Forum

Posted: **Sun Apr 20, 2014 10:28 pm**

Dear Daniele,

if i want to calculate y-component of oscillator strength i have in my 06_BSE this keyword :

% BLongDir
 0.000000 | 1.000000 | 0.000000 |        # [BSS] [cc] Electric Field
%

but i also have this keyword in the input files of 03_real_axis and 05_W, too.
Now should i also have the same 0 1 0 in 03_real_axis and 05_W input files, too
or can i say, i let BLongDir in 03_real_axis and 05_W be 1 0 0 and calculate BSE in my 06_BSE with 0 1 0 configuration ???

Bests
Martin

Posted: **Mon Apr 21, 2014 9:36 am**

Dear martin
The q limit in the absorption is determined in the bse part. You do not need to change the q limit in the screening and gw which affect the dielectric matrix which usually does not play an important role unless you have an highly anysotropic system.
Best
Daniele

Posted: **Sat Apr 26, 2014 3:57 am**

Dear Daniele,

What is the unit of the oscillator strength in yambo?

Bests
Martin

Posted: **Sat Apr 26, 2014 8:41 am**

Dear Martin,
I think that the units are arbitrary. The absorption it is calculated as Im(\epsilon_m).

Daniele

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