What is Fermi-Dirac statistics?
'''Fermi-Dirac statistics''' is a branch of [[quantum statistics]]. It is named after [[Enrico Fermi]] and [[Paul Dirac]]. It is used to describe the [[macroscopic]] state of a system which is made of many simliar particles ([[Fermion]]s). One example is to describe the state of [[electron]]s in [[metal]]s and [[semimetal]]s, to describe [[electrical conductivity]]. Fermi-Dirac statistics makes the following assumptions: *None of the states of the particles can hold more than one particle (known as [[Pauli exclusion principle]]) *Exchanging a particle for another similar particle will not lead to a new state, but will give the same state (known as [[Identical particles]]) The '''Fermi distribution''' tells with what [[probability]], a [[Fermi gas]], at a given temperature and energy level, will have a particle in the given state. [[Category:Quantum mechanics]]