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\section{Plasmonics}  The scope of real-space real-time approaches is not confined to the  atomistic description of matter. For instance, finite-difference   time-domain\cite{Taflove_1980} time-domain~\cite{Taflove_1980}  (FDTD) is a standard numerical tool of computational electromagnetism, while lattice Boltzmann methods\cite{Benzi_1992} methods~\cite{Benzi_1992}  (LBM) are widely used in computational fluid dynamics. Indeed, real-space  real-time approaches can be used to model physical processes on rather  different space- and time-scales. This mere observation also bears