Abstract
Infrared absorption due to a collective excitation of a two-dimensional electronic gas was observed in GaAs/As multiple-quantum wells when the incident light is polarized parallel to the quantum-well plane. We attribute this phenomenon to a plasma oscillation in the quantum wells. The measured wavelength of the absorption peak due to the plasma oscillation agrees with our theoretical analysis. In addition, in this study the plasma-phonon coupling effect is also fitted to the experimental result. We show that the absorption is not related to the intersubband transitions but to the intrasubband transition, which originates from a plasma oscillation.
- Received 3 February 1995
DOI:https://doi.org/10.1103/PhysRevB.52.1848
©1995 American Physical Society