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We present theory of the carrier-optical interaction in 1D systems based onthe non-equilibrium Greens function formalism in the 4x4 k.p model. As arepresentative parameters we chose the GaAs. Although theory is presented in4x4 k.p many subbands, results and discussion section is based on thesimplified model such as 2x2 k.p model (two transverse modes). Even though 2x2k.p model is simple enough it shows many phenomena that have not been seenbefore. We focus mainly on the ballistic extraction of photogenerated freecarriers at the radiative limit which is described by the self-energy termderived in dipole approximation and solved in self-consistent manner withKeldysh quantum kinetic equations. Any relaxation or non-radiativerecombination mechanisms as well as excitonic features are neglected. Effect ofnon-locality of electron-photon self energy term is considered and discussed.Spontaneous emission is also considered and shown to be small in short devicesunder medium bias conditions. Electron and hole spatial current oscillationsare seen and discussed. It is shown that neglecting off-diagonal correlation inthe band index not only produces quantitatively wrong results but it alsoalters the qualitative picture. All simulations are done in the full-rankapproximation, with all spatial and band correlation effects are kept intact.This allows us to study not only quantitative effects but also qualitativebehaviour.

Optoelectronic response calculations in the framework of k.p coupled to Non-equilibrium Green's functions for 1D systems in the ballistic limit