Classical effects in the weak-field magnetoresistance of InGaAs/InAlAs quantum wells
M. Yu. Melnikov+, A. A. Shashkin+, V. T. Dolgopolov+, G. Biasiol*, S. Roddaro#, L. Sorba#
+Institute of Solid State Physics, 142432, Chernogolovka, Russia
*IOM CNR, Laboratorio TASC, 34149 Trieste, Italy
#NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, 56127 Pisa, Italy
Abstract
We observe an unusual behavior of the low-temperature
magnetoresistance of
the high-mobility two-dimensional electron gas in InGaAs/InAlAs quantum
wells
in weak perpendicular magnetic fields. The observed magnetoresistance is
qualitatively similar to that expected for the weak localization and
anti-localization but its quantity exceeds significantly the scale of the quantum
corrections. The calculations show that the obtained data can be explained by
the classical effects in electron motion along the open orbits in a
quasiperiodic potential relief manifested by the presence of ridges on
the quantum well surface.