Eigenstates of a periodic Hamiltonian are ψ_{nk}(r) = e^{ik·r} u_{nk}(r) with u periodic; labels = band index n, crystal momentum k.
Eigenstates of a periodic Hamiltonian are ψ_{nk}(r) = e^{ik·r} u_{nk}(r) with u periodic; labels = band index n, crystal momentum k.