Spin susceptibility of an ultra-low-density two-dimensional electron system

J Zhu; H L Stormer; L N Pfeiffer; K W Baldwin; K W West

doi:10.1103/PhysRevLett.90.056805

Spin susceptibility of an ultra-low-density two-dimensional electron system

Phys Rev Lett. 2003 Feb 7;90(5):056805. doi: 10.1103/PhysRevLett.90.056805. Epub 2003 Feb 7.

Authors

J Zhu¹, H L Stormer, L N Pfeiffer, K W Baldwin, K W West

Affiliation

¹ Department of Physics, Columbia University, New York, New York 10027, USA.

PMID: 12633387
DOI: 10.1103/PhysRevLett.90.056805

Abstract

We determine the spin susceptibility in a two-dimensional electron system in GaAs/AlGaAs over a wide range of low densities from 2x10(9) cm(-2) to 4x10(10) cm(-2). Our data can be fitted to an equation that describes the density dependence as well as the polarization dependence of the spin susceptibility. It can account for the anomalous g factors reported recently in GaAs electron and hole systems. The paramagnetic spin susceptibility increases with decreasing density as expected from theoretical calculations.