Rev. Mod. Phys. 73, 251–266 (2001)Metallic behavior and related phenomena in two dimensionsPublished 14 March 2001 For about 20 years, it has been the prevailing view that there can be no metallic state or metal-insulator transition in two dimensions in zero magnetic field. In the last several years, however, unusual behavior suggestive of such a transition has been reported in a variety of dilute two-dimensional electron and hole systems. The physics behind these observations is at present not understood. The authors review and discuss the main experimental findings and suggested theoretical models. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/RevModPhys.73.251
DOI:
10.1103/RevModPhys.73.251
PACS:
71.30.+h, 01.30.Rr, 72.60.+g, 85.30.Tv, 73.21.-b
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