Linear response in velocity gauge

In this tutorial we show how to get the linear response using the velocity gauge instead of the Berry phase approach in length gauge.
We use the same DFT input files of the tutorial Linear response using Dynamical Berry Phase, run the same setup and remove the symmetries.

Real-time dynamics in velocity gauge

Then in order to calculate the response in velocity gauge we use the command yambo_nl -u p -V nl -F input_lr.in to generate the input: