Valley splitting of AlAs two-dimensional electrons in a perpendicular magnetic field

Details Valley splitting of AlAs two-dimensional electrons in a perpendicular magnetic field Valley splitting of AlAs two-dimensional electrons in a perpendicular magnetic field

2002-07-17

arxiv.org/abs/cond-mat/0207431v1

Phys. Rev. Lett. 89, 226805 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex4: 4 pages, 4 figures. Submitted for publication

Scientific paper

10.1103/PhysRevLett.89.226805

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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