Lumen forum

Dear davide
I followed your instructions: first entered export OMP_NUM_THREADS=1, then ran the command ~/codes/lumen-2.1.0-sp-omp/bin/ypp -F ypp.in -J GW-final, and the exciton distribution plot was generated successfully.
Thank you very much for your guidance.
Xiao meng

Dear developers,
I encountered a Segmentation fault error (as shown in the picture) when executing the post-processing of exciton distribution using lumen-2.1.0-sp-omp and lumen-2.0.1-sp-omp:
~/codes/lumen-2.0.1-sp-omp/bin/ypp -e w -J GW-final -v all
However, it can be executed successfully when ...

Dear developers,
I used exactly the same computational parameters for both the BSE calculation and shift current calculation of the material.
However, the peak positions of the plotted absorption spectrum and shift current spectrum do not correspond to each other.
I would like to figure out the ...

Dear developers,
I am currently working on running the nonlinear shift current calculation. I have installed yambopy following the official steps, and I am using the latest official script with yambopy version v0.7.1. However, I encountered the following error when running the code:

Traceback ...

Dear Develoeprs,
I am running Lumen 2.0.1 and noticed that in the new release note “calculation of Xo response function in G-space: The implementation of the Xo response function has been re-written by taking advantage of lapack GEMM. The new implementation is fully GPU ported by using devxlib_xGEMM ...

Ok, in this case

uninstall the yambopy you have installed with the command:

pip uninstall yambopy

download the new one with the commands:

git clone https://github.com/yambo-code/yambopy.git
cd yambopy
git checkout bug-fixes

now install it with the command, from the yambopy folder ...

Davide wrote: Wed Jan 28, 2026 10:09 am Dear Xiaomeng,
just a comment on the format of the messages-

Instead of attaching images, please copy and paste the code and use the "code block" format.

Best,
D.

Okay, I will pay more attention next time. Thank you very much for your suggestion.
Best,
xiaomeng

Dear claudio,

Thank you very much for your guidance. The calculation now runs successfully, and I have obtained the files
o.YamboPy-Sigma_probe_order_0–4.

I still have one question: what physical quantities are described by orders 0 to 4 in o.YamboPy-Sigma_probe_order_0–4?
In particular, which ...

Dear claudio

Thank you for your reply.
I have followed your steps, but YamboPy still shows the previous installation time instead of the latest one. It seems the new version wasn't applied, and running the Python script still doesn't work. What should I do in this case?

xiaomeng

Dear claudio

Thank you for your reply!
I used yambopy for the calculation, but the error shown in the figure occurs.
The script and the corresponding error are given below.
I would appreciate your help in resolving this issue.

Thanks!

xiaomeng