Local and quasilocal energy levels of electrons on nanotube surfaces and in rings in magnetic fields

Abstract

The Lifshitz local perturbation technique is used to examine impurity states of electrons on nanotube surfaces and in rings in magnetic fields. It is shown that an impurity in the form of a thin ring on a tube can form local and quasilocal electron states. The positions and widths of the impurity levels are found. These quantities on tubes and rings are calculated numerically for the parameters of semiconductor structures.