Phys. Rev. Lett. 89, 226805 (2002) [4 pages]Valley Splitting of AlAs Two-Dimensional Electrons in a Perpendicular Magnetic FieldReceived 14 July 2002; published 7 November 2002 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.226805
DOI:
10.1103/PhysRevLett.89.226805
PACS:
73.21.Fg, 73.23.–b, 73.43.Fj
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