Physics – Condensed Matter
Scientific paper
1996-04-24
Physics
Condensed Matter
5 pages RevTex + 4 fig., to appear in PRB, Rapid Comm
Scientific paper
10.1103/PhysRevB.53.R13260
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 $\nu <1$, 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 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).
Eberl Karl
Fal'ko Vladimir. I.
Haug Rolf. J.
Klitzing Klaus von
Kukushkin I. V.
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