oh_ iohABand theoryjAIqzAqzAdqqwpLq_AA dqGlM[A(dq)g Band theory (BANDORI argument, Band theory), the periodic atomic arrangement, with a molecular substance, is one of the theories described by the quantum mechanics of electrons in the crystal state in particular, typically, in the crystal electron energy , the (electronic) wavenumber W\ Function representing the relationship vZ@SwB Point to a general method of calculation.
ubzAdqg (dqdq )A gqwB According to the theorem of Bloch, the electronic wave function in the crystal (electronic states of electrons in crystals), which is designated by the number of quantum called the wavenumber. AGlM[gWIB This may have been written to ensure that the principleSERU an expression of energy and frequency.
GlM[ohdq`A tF~MbvA GlM[ohtF~B In semiconductors and insulators the energy band is divided into zones conduction and valence band, place semi-Lumi Fellows will present in the gap in the metal crosses the Fermi surface is at least one energy band. tAGlM[ohAB Conversely, some features of this energy band can be classified as metallic and insulating materials.
A`20ImB These metals, the picture of the classification of the insulator 20 in the middle of the century had been established. Poh_i bg jA dqnB The simple band theory can not explain, however, isolated state (Mott insulator) and there have also been research in the field called strongly correlated electron systems.