Crossed magnetic fields technique for studying spin and orbital properties of 2d electrons in the dilute regime

We developed a crossed magnetic field technique, which allowed us to probe separately the spin and orbital properties of two-dimensional (2D) electrons. Using this technique, we measured directly the spin susceptibility, the effective electron mass and g-factor in diluted 2D systems near the metal–insulator transition. All these quantities increase gradually with decreasing electron density: e.g., the susceptibility increases by a factor of 4 at View the MathML source. We have also studied the effect of the in-plane magnetic field B|| on dephasing. At high electron densities (View the MathML source), the dephasing time τϕ decreases with B|| much stronger than the momentum relaxation time τ. At small n, on the contrary, the increase of the dephasing rate with B|| is less than that for τ. In the latter case, the dependence τϕ(B||) can be attributed to enhancement of dephasing by the B||-induced disorder.