Low frequency collective excitations in the quantum-hall system

E. Y. Andrei, D. C. Glattli, F. I.B. Williams, M. Heiblum

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

We report the observation of low frequency collective excitations of the two-dimensional electron system in a GaAs/GaAlAs heterojunction in a magnetic field. The excitations are present for temperatures less than 2 K and fields corresponding to filling factors between ν = 1 2 and ν = 7. Their dispersion relation is linear in the wave vector k, and shows no evidence of a gap. These modes vanish between the Hall plateaus and elsewhere their propagation velocity follows a H-1 1n(αH) field dependence. The features of these modes are consistent with a propagating perimeter wave in a quantum 2D Coulomb system.

Original languageEnglish (US)
Pages (from-to)501-506
Number of pages6
JournalSurface Science
Volume196
Issue number1-3
DOIs
StatePublished - 1988

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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