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 |
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Pages (from-to) | 3428-3431 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 67 |
Issue number | 24 |
DOIs | |
Publication status | Published - 1991 |
Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy(all)