Abstract
It is noted that contacts of a two-dimensional (2DEG) electronic system with “external” metallic electrodes destroy the spatial uniformity of the density of the system. This gives rise to specific dimensional effects for the conductance of an unscreened Corbino disk in a magnetic field sufficient for the appearance of local regions with an integer-valued filling factor in the electron density profile. The overall pattern of the transport voltage distribution along the disk is seriously transformed. It becomes possible to explain the large (compared with the cyclotron energy) values of the critical transport voltage, leading to breakdown of the QHE regime. The experiment qualitatively confirms the predictions of the theory.
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