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.
@article{arxiv.cond-mat/0207431,
title = {Valley splitting of AlAs two-dimensional electrons in a perpendicular magnetic field},
author = {Y. P. Shkolnikov and E. P. De Poortere and E. Tutuc and M. Shayegan},
journal= {arXiv preprint arXiv:cond-mat/0207431},
year = {2007}
}
Comments
Revtex4: 4 pages, 4 figures. Submitted for publication