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### Question concerning oscillator strentgh

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 :

Code: Select all

% 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

### Re: Question concerning oscillator strentgh

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

### Re: Question concerning oscillator strentgh

Posted: Sat Apr 26, 2014 3:57 am
Dear Daniele,

What is the unit of the oscillator strength in yambo?

Bests
Martin

### Re: Question concerning oscillator strentgh

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