M. V. Budantsev, Z. D. Kvon, A. G. Pogosov, G. M. Gusev, J. C. Portal, D. K. Maude, N. T. Moshegov, A. I. Toropov
Published 1998-02-18Version 1
We investigate the transport in a two-dimensional (2D) lattice of coupled Sinai billiards fabricated on the basis of a high-mobility 2D electron gas in GaAs/AlGaAs heterojunction. For the states with low reduced conductivity g<<1 an anomalously weak temperature dependence of g was found. The large negative magnetoresistance described by the Lorentz line-shape of the width corresponding to the half magnetic flux quantum through the area of the billiard is observed. In going from g>1 to g<<1 it strongly increases. The Shubnikov-de Haas oscillations and commensurability magnetoresistance peak are preserved at g<<1. The data suggest that the system studied behaves more like a metal than an insulator at g<<1 and is not described by the generally accepted picture of Anderson localization.
Comments: 8 pages, 3 figures. Submitted to Phys. Rev. Lett
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