I want to plot the berry curvature flux by considering $k_x$ and $k_y$ plane in momentum space. I have experience running DFT calculations in Quantum ESPRESSO. I have tried reading the user manual of Wannier90 tool but didn't find any way to do this. The below image can be referred for more under...

Is there any way to get a memory estimate for VASP calculations either directly or indirectly (based on some example calculation)? For example, I would like to be able to predict based on my settings how much memory is needed within about a GB per core.

I have some confusion to calculating the energy for the isolated atom (for constructing the input file): Should I need to change the lattice parameter of my unit cell or whatever I have for my unit cell I can keep that. Also let say I have 4 atoms of one type in my unit cell, so I can consider ...