Spin Susceptibility of Interacting Two-dimensional Electrons with Anisotropic Effective Mass

Abstract

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 sqrt(ml.mt). Proper treatment of an interacting 2D system with an anisotropic effective mass therefore remains a theoretical challenge.

4 pages, 3 figures, accepted for publication in Phys. Rev. B

References in corpus (5)

• Low-temperature, in situ tunable, uniaxial stress measurements in semiconductors using a piezoelectric actuator
• Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom
• Density dependent spin susceptibility and effective mass in interacting quasi-two dimensional electron systems
• Exchange instabilities in electron systems: Bloch versus Stoner Ferromagnetism
• Giant low-temperature piezoresistance effect in AlAs two-dimensional electrons

Cited by in corpus (5)

• Spin susceptibility and effective mass of two-dimensional electrons in MgxZn1-xO/ZnO heterostructures
• Nonanalytic paramagnetic response of itinerant fermions away and near a ferromagnetic quantum phase transition
• Non-analytic spin susceptibility of a nested Fermi liquid: the case of Fe-based pnictides
• Parallel Magnetic Field Tuning of Valley Splitting in AlAs Two-Dimensional Electrons
• Enhancement of valley susceptibility upon complete spin-polarization