Crystal momentum

A wave packet with dispersion, which causes the group velocity and phase velocity to be different. This image is a 1-dimensional real wave, but electron wave packets are 3-dimensional complex waves.

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 $\mathbf{k}$ of this lattice, according to

(where $\hbar$ is the reduced Planck's constant). Like mechanical momentum, crystal momentum is frequently conserved, making it useful to physicists and materials scientists as an analytical tool.

单词	Crystal momentum
释义	Crystal momentum 英语百科 Crystal momentum 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 $\mathbf{k}$ of this lattice, according to (where $\hbar$ is the reduced Planck's constant). Like mechanical momentum, crystal momentum is frequently conserved, making it useful to physicists and materials scientists as an analytical tool.
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