TY - JOUR
T1 - AlAs two-dimensional electrons in an antidot lattice
T2 - Electron pinball with elliptical Fermi contours
AU - Gunawan, O.
AU - De Poortere, E. P.
AU - Shayegan, M.
PY - 2007/2/26
Y1 - 2007/2/26
N2 - 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 μm. 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±0.4, a fundamental parameter for the anisotropic conduction bands in AlAs.
AB - 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 μm. 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±0.4, a fundamental parameter for the anisotropic conduction bands in AlAs.
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U2 - 10.1103/PhysRevB.75.081304
DO - 10.1103/PhysRevB.75.081304
M3 - Article
AN - SCOPUS:33847333728
SN - 1098-0121
VL - 75
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 8
M1 - 081304
ER -