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 As 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.
- Received 25 July 1991
DOI:https://doi.org/10.1103/PhysRevLett.67.3428
©1991 American Physical Society