Magnetorotons in quasi-three-dimensional electron systems

K. Karraï, X. Ying, H. D. Drew, M. Santos, M. Shayegan, S. R.E. Yang, A. H. MacDonald

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


The dispersion relation for magnetoplasmons propagating perpendicular to the magnetic field is investigated for a quasi-three-dimensional electron system. The magnetic field is in the plane of a 100-nm-wide electron slab which is confined by a wide AlxGa1-xAs parabolic quantum well. A minimum is found in the magnetoplasma dispersion relation indicating the existence of a magnetoroton excitation for wave vector q about twice the inverse magnetic length. Calculations of the dispersion relation within the single-mode approximation are in good qualitative agreement with the measurements.

Original languageEnglish (US)
Pages (from-to)3428-3431
Number of pages4
JournalPhysical review letters
Issue number24
StatePublished - 1991

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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