The _k-vector_ refers to the [wave vector](matter%20waves.md) of an [electron](electron) or [[hole]] in a [lattice.](Crystal%20lattices.md) This is also referred to as the _crystal momentum._ The k-vector is equivalently the [reciprocal lattice vector.](Crystal%20lattices.md#Reciprocal%20lattices) #QuantumMechanics/MultiParticleQuantumSystems/SolidStatePhysics #QuantumMechanics/MultiParticleQuantumSystems/SolidStatePhysics/lattices