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

Research output: Contribution to journalJournal article

Published

Journal publication date15/05/1996
JournalPhysical Review B
Journal number20
Volume53
Number of pages4
Pages13260-13263
Original languageEnglish

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).

Bibliographic note

© 1996 The American Physical Society