Magnetoplasmons in quantum rings

TL;DR

This paper investigates the electronic structure and dipole response of quantum rings under magnetic fields using density functional theory, comparing theoretical results with experimental data on nanorings and quantum rings.

Contribution

It provides a detailed theoretical analysis of magnetoplasmon behavior in quantum rings of different sizes, including comparisons with experimental observations.

Findings

Dipole charge density response varies with magnetic field.

Qualitative agreement with experimental data on microrings and antidots.

Insights into quantum effects in small electron rings.

Abstract

We have studied the structure and dipole charge density response of nanorings as a function of the magnetic field using local-spin density functional theory. Two small rings consisting of 12 and 22 electrons confined by a positively charged background are used to represent the cases of a narrow and a wide ring. The results are qualitatively compared with experimental data existing on microrings and on antidots. A smaller ring containing 5 electrons is also analyzed to allow for a closer comparison with a recent experiment on a two electron quantum ring.