Abstract
We have measured the dispersion of magnetoplasmons in high-density InAs/GaSb quantum wells. At zero magnetic field we find an offset 3/4 (q is the plasmon wave vector, is the Fermi velocity) with respect to the local plasmon frequency which is a direct manifestation of the Fermi pressure in a two-dimensional electron system. © 1996 The American Physical Society.
- Received 22 May 1996
DOI:https://doi.org/10.1103/PhysRevB.54.7651
©1996 American Physical Society