Yambo Community Forum

Posted: **Mon Aug 23, 2021 5:11 am**

Hi folks,

I have some folders arranged as:
>output : containing all ndb.BS files from coupling diagonalization
>SAVE: containing the usual fragmented files
>qp-0K: containing all the ndb.elph_gFsq* files
The degenerate excitonic states are indexed at 901-902. How should I obtain the excitonic eliashberg from these files?

Regards,
Sitangshu

Posted: **Fri Aug 27, 2021 2:40 pm**

Dear Sitangshu

in order to obtain the excitonic eliashberg functions, you run

ypp_ph -e e

and then in the input you can specify the states you are interested in, for example:

Code: Select all

 excitons                         # [R] Excitonic properties
 eliashberg                       # [R] Eliashberg
 States= "901 - 902"                  # Index of the BS state(s) 
 BSQindex= 1                      # Q-Index of the BS state(s)
 Degen_Step= 0.010000       eV    # Maximum energy separation of two degenerate states
 PhBroad= 0.010000          eV    # Phonon broadening (Eliashberg & DOS)
 PhStps= 200                      # Energy steps

best
Claudio

ps when you run the BSE do not forget to uncomment the flag: WRbsWF

Posted: **Mon Aug 30, 2021 7:02 am**

Thanks Professor Claudio.

Regards,
Sitangshu

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