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Solidstate physicsSolidstate physics, the largest branch of condensed matter physics, is the study of rigid matter, or solids. The bulk of solidstate physics theory and research is focused on crystals, largely because the periodicity of atoms in a crystal — its defining characteristic —facilitates mathematical modeling, and also because crystalline materials often have electrical, magnetic, optical, or mechanical properties that can be exploited for engineering purposes. Additional recommended knowledgeThe framework of most solidstate physics theory is the Schrödinger (wave) formulation of nonrelativistic quantum mechanics. Bloch's Theorem, which characterizes the wavefunctions of electrons in a periodic potential, is an important starting point for much analysis. Since Bloch's Theorem applies only to periodic potentials, and since unceasing random movements of atoms in a crystal disrupt periodicity, this use of Bloch's Theorem is only an approximation, but it has proven to be a tremendously valuable approximation, without which most solidstate physics analysis would be intractable. Deviations from periodicity are treated by quantum mechanical perturbation theory. Topics
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Solidstate_physics". A list of authors is available in Wikipedia. 