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

2004/02/15 by Y. P. Shkolnikov, K. Vakili, E. P. De Poortere +1 · 9 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.92.246804

published as Phys. Rev. Lett. 92, 246804 (2004) · 4 pages, 3 figures

arxiv created 2004/02/15 · openalex publication_date 2004/06/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report measurements of the spin susceptibility, chi proportional, variant g(v)g*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 (g(v) 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 (g(v)=2), the measured g*m* is smaller than when only one valley is occupied (g(v)=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.

Cited by

• Observation of Quantum Hall “Valley Skyrmions”
• Effects of Thickness on the Spin Susceptibility of the Two Dimensional Electron Gas
• Spin-Independent Effective Mass in a Valley-Degenerate Electron System
• Metal–insulator transitions and the effects of electron–electron interactions in two-dimensional electron systems
• Spin susceptibility of interacting two-dimensional electrons with anisotropic effective mass
• Valley Polarization and Susceptibility of Composite Fermions around a Filling Factorν=32
• Parallel magnetic-field tuning of valley splitting in AlAs two-dimensional electrons
• Valley Susceptibility of an Interacting Two-Dimensional Electron System
• Spontaneous Valley Polarization of Itinerant Electrons

Related

• Electronic properties in a two-dimensional disordered electron liquid: Spin-valley interplay
• Spin properties of a two dimensional electron system: valley degeneracy and finite thickness effects
• Density-dependent spin susceptibility and effective mass in interacting quasi-two-dimensional electron systems
• Sharply increasing effective mass: a precursor of the spontaneous spin polarization in a dilute two-dimensional electron system
• Valley Splitting of AlAs Two-Dimensional Electrons in a Perpendicular Magnetic Field