I am somewhat of a novice in computational chemistry of materials, and have been tasked to replicate simulations from a relevant paper. The paper is a bit scant on details so I am trying to recreate its exact input, as closely as possible from their description. I have fundamental understanding of pseudo potentials and basis sets, but I could not figure out what the following line implies:
... Goedecker pseudopotentials used in all simulations. Kohn-Sham orbitals expanded in triple-zeta plus polarization Gaussian-type basis and the charge density expanded in plane waves with a 300 Ry cut-off.
What is meant by "gaussian basis for KS" and "plane-wave for charge density"? Is charge density not derived from the KS orbitals? How and why mix two different kind of basis?
I apologize in advance if what I asked is too naïve, most of my quantum chemistry knowledge is text book level, not research paper level!
Just as I posted this, this showed up in the side bar, which gave me a thread to start exploring (GAPW). That answers one of my three questions I believe.