Transport and optical properties of terahertz-driven two-dimensional electron gases

A simple theory is developed for studying interactions between electrons an d intense laser fields in two-dimensional electron gases, in conjunction wi th recent experiments where terahertz free-electron lasers are employed as intense radiation sources in investigating optoelectronic properties of sem iconductors. With these approaches, the transport and optical coefficients can be calculated easily for an electron-photon-phonon system. The results obtained from this study can be used for understanding and interpreting the experimental findings reported recently. (C) 2001 Elsevier Science B.V. Al l rights reserved.