Kovalskii, V. A and Gubarev, S. I. and Kukushkin, I. V. and Mikhailov, Sergey A. and Smet, J. H. and Klitzing, Klaus von and Wegscheider, Werner
Microwave response of two-dimensional electron rings.
Physical Review B (PRB) 73 (19), p. 185302.
We report microwave absorption studies on rings containing two-dimensional electrons. The absorption is measured on single rings with different widths using an optical luminescence technique. The dispersion of the plasmon modes has been determined in the presence of a perpendicular magnetic field. The transformation of two-dimensional plasmons in the disk geometry into plasmons with one-dimensional character in a narrow ring is addressed. Experimental data are compared with theoretical estimates based on a self-consistent solution of the Poisson and hydrodynamic equations.