Current-voltage characteristics of Corbino disks under quantum Hall effect conditions

This is a discussion of the details of the current-voltage characteristics of a 2D Corbino disk with a uniform density of mobile carriers in the quantum Hall effect plateau. It is shown that diffusion may be one of the reasons for the variety of observed current-voltage characteristics. The anomalous role of diffusion in the formation of the current-voltage characteristics of Corbino disks is determined by the dimensionality of the problem, as well as by the "quality" of the density of states of the magnetized 2D conducting system. The diffusion hypothesis is applied to some specific results and provides an explanation of the difference between the current-voltage characteristics shown in Figs. 1 and 2. (C) 2016 AIP Publishing LLC.