Exchange instabilities in electron systems: Bloch versus Stoner Ferromagnetism

Details Exchange instabilities in electron systems: Bloch versus Stoner Ferromagnetism Exchange instabilities in electron systems: Bloch versus Stoner Ferromagnetism

2005-01-10

arxiv.org/abs/cond-mat/0501213v2

Phys. Rev. B 72, 115317 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Revised version. Accepted for publication in PRB

Scientific paper

10.1103/PhysRevB.72.115317

We show that 2D and 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, which 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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