Positive Magnetoresistance Induced by Zeeman Splitting in Two-Dimensional Systems

It is shown that In T term of the conductivity due to electron-electron interaction, discussed by Altshuler et al. and by Fukuyama, is partly suppressed by Zeeman splitting of the electronic levels. Magnetoconductance of the form ln H appears when the Zeeman energy is much larger than κ T . The magnitude of this term is independent of the direction of the magnetic field and its prefactor is \({-}e²/2 π² \) when the screening length is much smaller than the Fermi wave length.