Exchange instabilities in electron systems: Bloch versus Stoner Ferromagnetism

Abstract

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.

Revised version. Accepted for publication in PRB

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Cited by in corpus (14)

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• Strongly interaction-enhanced valley magnetic response in monolayer WSe2
• Spin-Droplet State of an Interacting 2D Electron System
• Nonlinear 2D Spin Susceptibility in a Finite Magnetic Field: Spin-Polarization Dependence
• Spin Susceptibility of Interacting Two-dimensional Electrons with Anisotropic Effective Mass
• Universal enhancement of superconductivity in two dimensional semiconductors at low doping by electron-electron interaction
• Interplay among spin, orbital effects and localization in a GaAs two-dimensional electron gas in a strong in-plane magnetic field
• Orbital and spin order in oxide two-dimensional electron gases
• Competition of Exchange and Correlation Energies in Two-Dimensional $N$-component Electron Gas Ferromagnetism
• Superconductivity near Pomeranchuk instabilities in the spin channel
• Ferromagnetism of electron gas
• Metastable and spin-polarized states in electron systems with localized electron-electron interaction
• Reentrant Bloch ferromagnetism
• Stoner-type theory of Magnetism in Silicon MOSFETs