Injection current

[javad]

Dear Yambo developers,

I saw the new tutorial on shift current and would like to ask:
Could you please confirm whether Yambo can also calculate the injection current and the spin injection current?

Best regards,
Javad

[claudio]

Dear Javad,

Thank you for your question on these two response functions.
I'm no expert on injection currents, but I'll do my best to explain what I know.

Injection current
Injection current can be calculated using circularly polarized light.
In the same way as shift current, although I have never tried to do so. In principle, the code
should work with polarized light, but I have never tested it.
Note that in magnetic systems, injection and shift currents are mixed and cannot be distinguished, I think.


Spin injection current
Spin injection current can be calculated in a similar way to shift current in spin-polarized systems.
I also never tested the code with spin-polarized systems.

Let me know if you run any tests and if they work.
Best,
Claudio