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

doi:10.1103/PhysRevLett.67.3428

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 journal › Article › peer-review

27 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	3428-3431
Number of pages	4
Journal	Physical review letters
Volume	67
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.67.3428
Publication status	Published - 1991
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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AU - Karraï, K.

AU - Ying, X.

AU - Drew, H. D.

AU - Santos, M.

AU - Shayegan, M.

AU - Yang, S. R.E.

AU - MacDonald, A. H.

PY - 1991

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AB - 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.

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