Abstract
The optical-absorption spectrum is calculated for a quasi-two-dimensional electron gas interacting with polar optical phonons in a GaAs-As heterostructure. The importance of dynamical screening, the effect of the finite width of the two-dimensional electron layer, and the temperature dependence are investigated. The polaron mass is derived and is found to decrease with increasing electron density. For electron densities around the absorption spectrum shows in addition to the usual structure a shoulder at energy +ħ with the Fermi energy and ħ the optical-phonon energy.
- Received 18 February 1986
DOI:https://doi.org/10.1103/PhysRevB.34.2621
©1986 American Physical Society