2006/09/30 by O. Gunawan, Oki Gunawan, E. P. De Poortere +1 · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.75.081304
4 pages, 5 figures. Added simulation results and a remark highlighting the paper's relevance to "valleytronics"
arxiv created 2006/11/25 · openalex publication_date 2007/02/26 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report ballistic transport measurements in a two-dimensional electron system confined to an AlAs quantum well and patterned with square antidot lattices of period a=0.6, 0.8, 1.0, and 1.5\phantom\rule0.3em0ex\ensuremathμm. In this system two in-plane conduction-band valleys with elliptical Fermi contours are occupied. The low-field magnetoresistance traces exhibit peaks corresponding to the commensurability of the cyclotron orbits and the antidot lattice. From the dependence of the position of the peak associated with the smallest commensurate orbit on electron density and a, we deduce the ratio of the longitudinal and transverse effective masses ml∕mt=5.2\ifmmode±\else\textpm\fi0.4, a fundamental parameter for the anisotropic conduction bands in AlAs.