title: Spin susceptibility of an ultra-low-density two-dimensional electron system.
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.
authors.affiliation: Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: J
authors.initials: J
authors.lastname: Zhu
authors.forename: H L
authors.initials: HL
authors.lastname: Stormer
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: Baldwin
authors.forename: K W
authors.initials: KW
authors.lastname: West