Conductivity of a spin-polarized two-dimensional electron liquid in the   ballistic regime
  In the ballistic regime, the metallic temperature dependence of the conductivity in a two-dimensional electron system in silicon is found to change non-monotonically with the degree of spin polarization. In particular, it fades away just before the onset of complete spin polarization but reappears again in the fully spin-polarized state, being, however, suppressed relative to the zero-field case. Analysis of the degree of the suppression allows one to distinguish between the screening and the interaction-based theories. 
A. A. Shashkin, E. V. Deviatov, V. T. Dolgopolov, A. A. Kapustin, S.   Anissimova, A. Venkatesan, S. V. Kravchenko, and T. M...