Léon Brillouin (1889–1969) was a French physicist and a prominent figure in the field of condensed matter physics. He is best known for his contributions to the understanding of crystal dynamics and the theory of phonons, which are quantized modes of vibrations in a crystal lattice. One of his key contributions was the Brillouin zone concept, which is used in solid-state physics to describe the periodicity of the energy states of electrons in a crystalline solid.
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