Collective excitations in antidots

K. Kern, D. Heitmann, P. Grambow, Y. H. Zhang, K. Ploog

Research output: Contribution to journalArticlepeer-review

122 Scopus citations


Antidot structures have been prepared by etching arrays of 100-nm holes into a two-dimensional electron gas of GaxIn1-xAs 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.

Original languageEnglish (US)
Pages (from-to)1618-1621
Number of pages4
JournalPhysical Review Letters
Issue number12
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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