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Time-dependent nonequilibrium Green's functions (TDNEGF) are shown to providea flexible, effective tool for the description of quantum mechanical singleparticle scattering on a spatially localized, time-dependent potential.Focusing on numerical methods, arbitrary space and time dependence of thepotential can be treated, provided it is zero before an initial time instant.In this case, appropriate version of the Dyson and Keldysh equations lead to atransparent description with clear physical interpretation. The interaction ofa short laser pulse and an electron propagating initially in free space isdiscussed as an example.

Quantum mechanical scattering on time-dependent potentials using nonequilibrium Green's functions