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Magneto-optical evidence of the percolation nature of the metal-insulator transition in the 2D electron system

I. V. Kukushkin·Vladimir I. Fal'ko·R. J. Haug·K. v. Klitzing·K. Eberl
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Abstract

We compare the results of the transport and time-resolved magneto-luminescence measurements in disordered 2D electron systems in GaAs-AlGaAs heterostructures in the extreme quantum limit, in particular, in the vicinity of the metal-insulator transition (MIT). At filling factors $ν<1$, 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 interprete this result as a separation of the 2D electron system into a liquid and localized phases, especially because the MIT occurs strikingly close to those filling factors where the liquid occupies ${1\over 2}$ of the sample area (the percollation threshold condition in two-component media).

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I. V. Kukushkin, Vladimir I. Fal'ko, R. J. Haug, K. v. Klitzing, K. Eberl. 1996-04-24. Magneto-optical evidence of the percolation nature of the metal-insulator transition in the 2D electron system. https://doi.org/10.1103/physrevb.53.r13260

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