2D Lattice of coupled Sinai billiards: metal or insulator at g<<1

Details 2D Lattice of coupled Sinai billiards: metal or insulator at g<<1 2D Lattice of coupled Sinai billiards: metal or insulator at g<<1

1998-02-18

arxiv.org/abs/cond-mat/9802188v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 3 figures. Submitted to Phys. Rev. Lett

Scientific paper

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.

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