Current–voltage characteristic of a two-dimensional Corbino disk under the QHE conditions of quantum Hall effect

A theory of current–voltage characteristic (IVC) is proposed for a gated Corbino disk with a 2D spinless electron system and magnetic filling factors close to an integral value. The described results systematically include the features of the electrochemical potential of the 2D electron system in a magnetic field, which are responsible for sharp magnetocapacitance “dips” for integral values of the magnetic filling factor. The theory is used for qualitative interpretation of the observed weakly nonlinear peculiarities of IVC as well as for prediction of local details in the distribution of electron density and electric potential in a current-carrying Corbino disc. Corresponding measurements can be made, for instance, by using the linear electrooptical effect.