Spin Susceptibility of a 2D Electron System in GaAs towards the Weak   Interaction Region
  We determine the spin susceptibility $\chi$ in the weak interaction regime of a tunable, high quality, two-dimensional electron system in a GaAs/AlGaAs heterostructure. The band structure effects, modifying mass and g-factor, are carefully taken into accounts since they become appreciable for the large electron densities of the weak interaction regime. When properly normalized, $\chi$ decreases monotonically from 3 to 1.1 with increasing density over our experimental range from 0.1 to $4\times10^{11} cm^{-2}$. In the high density limit, $\chi$ tends correctly towards $\chi\to 1$ and compare well with recent theory. 
Y.-W. Tan (1), J. Zhu (1), H. L. Stormer (1,2,3), L. N. Pfeiffer (3),   K. W. Baldwin (3), K. W. West (3) ((1)Department of ...