Low frequency collective excitations in the quantum-hall system

  • Andrei E
  • Glattli D
  • Williams F
 et al. 
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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-11n(αH) field dependence. The features of these modes are consistent with a propagating perimeter wave in a quantum 2D Coulomb system. © 1987.

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  • E. Y. Andrei

  • D. C. Glattli

  • F. I B Williams

  • M. Heiblum

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