Valley splitting of AlAs two-dimensional electrons in a perpendicular magnetic field
Shkolnikov, Y. P. · De Poortere, E. P. · Tutuc, E. · Shayegan, M.
Original · EN
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 (2D) 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.
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