Phys. Rev. B 78, 233306 (2008) [4 pages]Parallel magnetic-field tuning of valley splitting in AlAs two-dimensional electronsReceived 27 October 2008; published 10 December 2008 We demonstrate that, in a quasi-two-dimensional electron system confined to an AlAs quantum well and occupying two conduction-band minima (valleys), a parallel magnetic field can couple to the electrons’ orbital motion and tune the energies of the two valleys by different amounts. The measured density imbalance between the two valleys, which is a measure of the valley susceptibility with respect to parallel magnetic field, is enhanced compared to the predictions of noninteracting calculations, reflecting the role of electron-electron interaction. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.233306
DOI:
10.1103/PhysRevB.78.233306
PACS:
73.43.Qt, 71.70.Fk, 72.25.Dc
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