Plane Wave Basis Set:

Dense discrete real space mesh by G-space size



z


psi(r)
z
n(r)

y


y

x
x

psi(r) = 3D-FFT{psi(g)}
n(r) = sum_k |psi_k(r)|^2
n(g) = 3D-IFFT{n(r)} exactly!



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