COLLECTIVE EXCITATIONS IN ANTIDOTS

被引：119

作者：

KERN, K

HEITMANN, D

GRAMBOW, P

ZHANG, YH

PLOOG, K

机构：

[1] Max-Planck-Institut F̈r Festkörperforschung, D-7000 Stuttgart 80

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 66卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.66.1618

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Antidot structures have been prepared by etching arrays of 100-nm holes into a two-dimensional electron gas of Ga(x)In1-x(As) quantum wells. In the far-infrared response we observe the unique collective excitation spectrum of antidots. It consists of a high-frequency branch which starts, in a magnetic field B, with a negative B dispersion and then increases in frequency with B. A second low-frequency branch corresponds at high B to edge magnetoplasmons which circulate around the holes. For small B this branch approaches the cyclotron frequency, where the electrons perform classical cyclotron orbits around the holes.

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页码：1618 / 1621

页数：4

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