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26 April 2024 |
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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
; | | Date: |
24 Apr 1996 | | 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 $
u <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 ${1over 2}$ of the sample area (the percollation threshold condition in two-component media). | | Source: | arXiv, cond-mat/9604153 | | Services: | Forum | Review | PDF | Favorites | |
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