2002/07/17 by Y. P. Shkolnikov, E. P. De Poortere, E. Tutuc +2 · 2 citations
Engineering · Physics and Astronomy · #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #Semiconductor materials and devices #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.89.226805
published as Phys. Rev. Lett. 89, 226805 (2002) · Revtex4: 4 pages, 4 figures. Submitted for publication
arxiv created 2002/07/17 · openalex publication_date 2002/11/07 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
By measuring the angles at which the Landau levels overlap in tilted magnetic fields (the coincidence method), we determine the splitting of the conduction-band valleys in high-mobility two-dimensional electrons confined to AlAs quantum wells. The data reveal that, while the valleys are nearly degenerate in the absence of magnetic field, they split as a function of perpendicular magnetic field. The splitting appears to depend primarily on the magnitude of the perpendicular component of the magnetic field, suggesting electron-electron interaction as its origin.