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  • PhysRevB.53.R13260

    Rights statement: © 1996 The American Physical Society

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Magneto-optical evidence of the percolation nature of the metal-insulator transition in the two-dimensional electron system

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<mark>Journal publication date</mark>15/05/1996
<mark>Journal</mark>Physical Review B
Issue number20
Volume53
Number of pages4
Pages (from-to)13260-13263
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

We compare the results of the transport and time-resolved magnetoluminescence measurements in disordered two-dimensional (2D) electron systems in GaAs-AlxGa1-xAs heterostructures in the extreme quantum limit, particularly in the vicinity of the metal-insulator transition (MIT). At filling factors nu<1, the optical signal has two components: the single-rate exponentially decaying part attributed to a uniform liquid and a power-law long-living tail specific to a microscopically inhomogeneous state of electrons. We interpret this result as a separation of the 2D electron system into liquid and localized phases, especially because the MIT occurs strikingly close to those filling factors where the liquid occupies 1/2 of the sample area (the percolation threshold condition in two-component media).

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© 1996 The American Physical Society