How does quantum mechanics describe electrical conductivity?

Due to the Pauli exclusion principle, no more than 1 electron can be in the same quantum state. When talking about conductivity, electrons are viewed in their momentum states, not so much their position states. In quantum mechanics, it is easier to deal with energies. read more

Electrical conductivity is the motion of electrons through a material. In quantum mechanics, the state of an electron is determined by its wavefunction [math]\Psi(\mathbf{x},t)[/math]. So, when we talk about the motion of electrons, we are really talking about the time evolution of the wavefunction. read more