Spontaneous spin polarization in a quantum wire

The existence of a predominantly symmetrical spin configuration (spin polarized phase) and 'diluted' density of stales (pseudo-gap) in a layer under the Fermi level in a quantum wire is predicted. The condition of cross-over from a non-polarized phase to a polarized one was derived. The effect essentially depends upon screening. The transition occurs for sufficiently low electron density in a wire and is accompanied by an acute decrease of the electron density of states near the Fermi level. It may result in a corresponding decrease in conductance.