Real Time Approach to Relaxation and Dephasing Processes in Semiconductors

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Abstract
Starting from the kinetic equations for the nonequilibrium Green's functions, a practical method is proposed which allows to solve the set of equations for the two‐time propagators numerically. In contrast to the usual semiconductor Bloch equations with phenomenological damping relaxation and dephasing processes are treated microscopically for the case of coupling to a bath of LO‐phonons. Beside a standard approximation for the treatment of LO‐phonon scattering, no further approximations are performed. For the low‐density limit we compare exact results with approximate treatments, as the Marcovian and non‐Marcovian approximations resulting from a density matrix approach. First results concerning nonlinear optical properties are presented.
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