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

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

2007-11-08

arxiv.org/abs/0711.1294v1

Phys. Rev. B 76, 233301 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

10.1103/PhysRevB.76.233301

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.

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