Dependence of Spin Susceptibility of a Two-Dimensional Electron System on the Valley Degree of Freedom

Y. P. Shkolnikov, K. Vakili, E. P. De Poortere, and M. Shayegan
Phys. Rev. Lett. 92, 246804 – Published 18 June 2004

Abstract

We report measurements of the spin susceptibility, χgvg*m*, in an AlAs two-dimensional electron system where, via the application of in-plane stress, we transfer electrons from one ellipsoidal conduction-band valley to another (gv is the valley degeneracy, and m* and g* are the electron effective mass and g factor). At a given density, when the two valleys are equally populated (gv=2), the measured g*m* is smaller than when only one valley is occupied (gv=1). This observation counters the common assumption that a two-valley two-dimensional system is effectively more dilute than a single-valley system because of its smaller Fermi energy.

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  • Received 15 February 2004

DOI:https://doi.org/10.1103/PhysRevLett.92.246804

©2004 American Physical Society

Authors & Affiliations

Y. P. Shkolnikov, K. Vakili, E. P. De Poortere, and M. Shayegan

  • Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA

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Vol. 92, Iss. 24 — 18 June 2004

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