Abstract
The collective excitations (plasmons) of a ring-shaped two-dimensional electron gas under a perpendicular magnetic field are studied. The hydrodynamical theory reveals that for each value of the excitation angular momentum, the spectrum can be characterized as a set of high-frequency bulk magnetoplasmons (with some of them displaying, however, an anomalous negative magnetodispersion) and two low-frequency edge magnetoplasmons circulating along the inner and outer ring boundaries, in opposite directions. Excellent quantitative agreement is obtained with all the available experimental data.
| Original language | English |
|---|---|
| Pages (from-to) | 12617-12620 |
| Number of pages | 4 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 53 |
| Issue number | 19 |
| DOIs | |
| State | Published - 1996 |
| Externally published | Yes |