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

Kukushkin, I. V. and Falko, Vladimir and Haug, R. J. and von Klitzing, K. and Eberl, K. (1996) Magneto-optical evidence of the percolation nature of the metal-insulator transition in the two-dimensional electron system. Physical Review B, 53 (20). pp. 13260-13263. ISSN 0163-1829

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    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).

    Item Type: Article
    Journal or Publication Title: Physical Review B
    Additional Information: © 1996 The American Physical Society
    Subjects: Q Science > QC Physics
    Departments: Faculty of Science and Technology > Physics
    ID Code: 57075
    Deposited By: ep_importer_pure
    Deposited On: 05 Sep 2012 17:38
    Refereed?: Yes
    Published?: Published
    Last Modified: 24 Jan 2014 05:31
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/57075

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