Dimensional effects on exciton states in nanorings

Abstract

Exciton states in nanorings are studied within the framework of the effective-massapproximation. The exciton level structure and binding energy in one- and two-dimensionalnanorings are found to be very different at small and large radius limits. The variation ofexciton energy levels with radius and width is shown. The important role of Coulombinteraction in exciton spectra is revealed. Our study is helpful for understanding thetransition of exciton states from the one-dimensional case to the two-dimensional case.