Phys. Rev. Lett. 93, 246603 (2004) [4 pages]Ballistic Electron Transport in AlAs Quantum WellsReceived 2 February 2004; published 8 December 2004 We report the observation of commensurability oscillations in an AlAs two-dimensional electron system where two conduction-band valleys with elliptical in-plane Fermi contours are occupied. The Fourier power spectrum of the oscillations shows two frequency components consistent with those expected for the Fermi contours of the two valleys. From an analysis of the spectra we deduce ml/mt=5.2±0.5 for the ratio of the longitudinal and transverse electron effective masses, a fundamental parameter that cannot be directly measured from other transport experiments. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.246603
DOI:
10.1103/PhysRevLett.93.246603
PACS:
72.20.–i, 73.23.Ad, 75.47.Jn
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