Exchange instabilities in electron systems: Bloch versus Stoner ferromagnetism

Ying Zhang and S. Das Sarma
Phys. Rev. B 72, 115317 – Published 15 September 2005

Abstract

We show that two-dimensional (2D) and three-dimensional (3D) electron systems with the long-range Coulomb electron-electron interaction could develop ferromagnetic instabilities due to strong exchange effects at low densities. The critical densities in both 2D and 3D systems, at which the magnetic instability could either be of Stoner type (second-order) or of Bloch type (first-order), are higher than the dispersion instability critical density where effective mass at the Fermi surface diverges. We discuss the theoretical as well as experimental implications of the ferromagnetic instability at low electron densities, particularly in low-disorder semiconductor-based two-dimensional systems.

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  • Received 10 January 2005

DOI:https://doi.org/10.1103/PhysRevB.72.115317

©2005 American Physical Society

Authors & Affiliations

Ying Zhang and S. Das Sarma

  • Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA

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Vol. 72, Iss. 11 — 15 September 2005

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