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### Re: Optical matrix elements

Posted: Tue Nov 20, 2018 3:05 pm
Dear Zahra,
I'm sorry but you are using a very old version that is not supported anymore.
I really strongly suggest you update to a newer version. If you have a problem in compiling you can write to the forum to ask help.
I added the following lines in ./src/pol_function/DIPOLE_driver.F after the call
Sorry, but I do not have the old source with me so I cannot tell you what's going wrong.

Note that the dipoles are only calculated once if they are present in a database (now ndb.dip_iR_and_P and not ndb.dipoles anymore)

Best,
Daniele

### Re: Optical matrix elements

Posted: Thu Aug 08, 2019 4:06 am
Dear Zahar:
Have you solved the problem regarding how to get the transition dipole moment when the calculation is conducted in a parallel run? Thanks a lot!

Bests!

Nannan Luo

### Re: Optical matrix elements

Posted: Thu Aug 22, 2019 9:44 am
Dear Nannan Luo,
the most efficient way to print dipoles elements is by a python script to read the database. This is independent from the fact the dipoles have been calcualted by a serial or a parallel run. Let me know if you need an example script.
Best,
Daniele

### Re: Optical matrix elements

Posted: Tue Aug 27, 2019 6:12 am
Dear Daniele Varsano:
Thanks for your replay, I really need an example script to deal with the transition dipole moment, could you share one? Many thanks!

Bests

Nannan Luo

### Re: Optical matrix elements

Posted: Tue Aug 27, 2019 12:19 pm
Dear Nannan Luo,
Here it goes a simple python script:

*Short explanation:
Read the dipole variable i<v|r|c> and <v|P|c>.
The dipole variable has 4 indexes that are:
1: Valence index from 1 to Nv (python index start from 0)
2: Conduction index from 0 to Nc (0 is the first conduction band up to the last calculated)
3: Direction 0,1,2 --> x,y,z
4. 0/1. real and imaginary part

In this example the ndb.dip_iR_and_P_fragment_1 file contains just 2 valences and 2 conduction bands.
next, it prints the dipoles and modulus. Finally some operation among dipole components you can ignore.

Best,
Daniele

### Re: Optical matrix elements

Posted: Thu Sep 12, 2019 4:03 am
Dear Daniele,
Is this scripts for dipole moment from IP instead of BSE results?

Thanks!

Shudong

### Re: Optical matrix elements

Posted: Fri Sep 13, 2019 9:04 am
Dear Shudong,
the script reads the dipole databases (ndb.dip_iR_and_P_fragment_*), i.e.
q.<v|r|c>
These are needed both in the IP response function and for the BSE spectra.

Best,
Daniele

### Re: Optical matrix elements

Posted: Wed Sep 18, 2019 8:33 am
Thanks Daniele. The unit of the matrix elements here is atomic unit or IS?

Thanks!

SD

### Re: Optical matrix elements

Posted: Wed Sep 18, 2019 8:47 am
Dear Shudong,
all the internal units are in atomic units.

Best,
Daniele

### Re: Optical matrix elements

Posted: Wed Sep 18, 2019 10:41 am
Dear Daniele,
I need the transition dipoles including e-h pairs, e.g. the excitionic effect. How could I obtain it since in the SAVE directory, the file ndb.BS_diago_Q01 is very huge and the BS matrix are not
in the format of matrix.

Thanks!

SD