Parallel magnetic-field tuning of valley splitting in AlAs two-dimensional electrons

2008/11/19 by T. Gokmen, Tayfun Gokmen, Medini Padmanabhan +6 · 14 citations
Engineering · Physics and Astronomy · #Condensed matter physics #Conduction band #Electron #Electron density #Field (mathematics) #Magnetic field #Maxima and minima #Physics #Quantum and electron transport phenomena #Quantum mechanics #Semiconductor Quantum Structures and Devices #Semiconductor materials and devices #cond-mat.mes-hall #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.78.233306

published in Physical Review B 78(23) (American Physical Society) · 4+ pages, 4 figures, accepted for publication in Phys. Rev. B

arxiv created 2008/11/19 · openalex publication_date 2008/12/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We demonstrate that, in a quasi-two-dimensional electron system confined to an AlAs quantum well and occupying two conduction-band minima (valleys), a parallel magnetic field can couple to the electrons' orbital motion and tune the energies of the two valleys by different amounts. The measured density imbalance between the two valleys, which is a measure of the valley susceptibility with respect to parallel magnetic field, is enhanced compared to the predictions of noninteracting calculations, reflecting the role of electron-electron interaction.

Citations

• AlAs two-dimensional electrons in an antidot lattice: Electron pinball with elliptical Fermi contours
• Effects of Thickness on the Spin Susceptibility of the Two Dimensional Electron Gas
• Dependence of Spin Susceptibility of a Two-Dimensional Electron System on the Valley Degree of Freedom
• Observation of Quantum Hall “Valley Skyrmions”
• Spin susceptibility of interacting two-dimensional electrons with anisotropic effective mass