SOFT EDGE MAGNETOPLASMONS IN 2D CIRCULAR POOLS OF HE-4 IONS

The recent experimental discovery of anomalous soft edge magnetoplasmo ns (EMP) in 2D charged systems(1, 2) and the problem of their identifi cation requires an analysis of their physical nature. We consider thre e different scenarios for the appearance of soft EMP modes proposed by different authors. Our analysis indicates that the anomalous soft mod es reported in Ref.(2) have the smooth variation of the charge density near the edge of the 2D system as their origin, although other satell ite modes remain unexplained.