Density-functional calculations of magnetoplasmons in quantum rings

We have studied the structure and dipole charge-density response of nanorin gs 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 pos itively charged background are used to represent the cases of narrow and wi de rings. The results are qualitatively compared with experimental data exi sting on microrings and on antidots, A smaller ring containing five electro ns is also analyzed to allow for a closer comparison with a recent experime nt on a two-electron quantum ring. [S0163-1829(99)02723-X].