Dynamical properties of a terahertz driven two-dimensional electron gas

In this paper, I present a detailed theoretical study on how a nanostructur e, such as a semiconductor-based two-dimensional electron gas (2DEG), inter acts with a linearly polarised intense laser field. A tractable method in d ealing with the time-dependent many-body problem has been developed, from w hich the electron Green's function, the electron density-density correlatio n function and the inverse dielectric function matrix for a 2DEG driven by intense laser fields have been obtained. Using these results, the influence of terahertz laser radiation on dynamical properties such as plasmon and o ptical spectra in a 2DEG is investigated. The results obtained from this st udy can be used for the case where the intense terahertz radiation is provi ded by recently developed free-electron laser sources.