Parallel Magnetic Field Tuning of Valley Splitting in AlAs Two-Dimensional Electrons

Details Parallel Magnetic Field Tuning of Valley Splitting in AlAs Two-Dimensional Electrons Parallel Magnetic Field Tuning of Valley Splitting in AlAs Two-Dimensional Electrons

2008-11-19

arxiv.org/abs/0811.3194v2

Phys. Rev. B 78, 233306 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 4 figures, accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.78.233306

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 non-interacting calculations, reflecting the role of electron-electron interaction.

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