Yambo Community Forum

Dear all,
To analysis the exciton, I generate the file *.exc_weights_at_1 by following the tourtial.
In the .exc_weights_at_1 file, we see that (note that I reduce the threshold of weight output to 0.01)
# Band_V Band_C K ibz Symm. Weight Energy
#
8.000 9.000 90.00 4.000 0.1288E-1 4.717
8.000 9.000 90.00 6.000 0.1288E-1 4.717
8.000 9.000 90.00 2.000 0.1287E-1 4.717
8.000 9.000 90.00 1.000 0.1287E-1 4.717
....
Now, I have two questions:
1. There are multiple Symm. for the same ibzK and Band_V_C pair, why? Do they mean the unfold of ibz?
2. Where can I find the symm. symbol (i.e., Ag, Au, etc) of these Symm. number? Which file?

Dear Youzhao,

yes the BSE is solved in the full BZ. Next, a transition in the expanded BZ is indicated as a k point in the IBZ plus a symmetry indicated by an index.
The symmetries matrices corresponding to the index are indicated in the report files in the section: Best,
Daniele