An interband transition moves an Electron between distinct energy bands. A direct optical transition approximately conserves crystal momentum because optical photon momentum is small compared with a reciprocal lattice vector. A phonon-assisted transition can supply the momentum difference needed near an indirect band gap. Transition energies alone do not fix their optical intensities, which also depend on matrix elements and occupations.

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  1. Electronic band structure
  2. Bloch's theorem
  3. Quantum theory
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