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High Quality Content by WIKIPEDIA articles! In solid-state physics crystal momentum or quasimomentum is a momentum-like vector associated with electrons in a crystal lattice. It is defined by the associated wave vectors k of this lattice, according to {mathbf{p}}_{crystal} equiv hbar {mathbf{k}} (where hbar is the reduced Planck's constant). Like regular momentum, crystal momentum frequently exhibits the property of being conserved, and is thus extraordinarily useful to physicists and materials scientists as an analytical tool.