We report measurements of the spin susceptibility in dilute (rs up to ≈10) AlAs two-dimensional (2D) electrons occupying a single conduction-band valley with an anisotropic in-plane Fermi contour, characterized by longitudinal and transverse effective masses ml and mt. As the density is decreased, the spin susceptibility is significantly enhanced over its band value, reflecting the role of interaction. Yet the enhancement is suppressed compared to the results of quantum Monte Carlo based calculations that take the finite thickness of the electron layer into account but assume an isotropic effective mass equal to ml. mt. Proper treatment of an interacting 2D system with an anisotropic effective mass therefore remains a theoretical challenge.
|Physical Review B - Condensed Matter and Materials Physics
|Published - Dec 10 2007
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics