Femtosecond functionalization of magnetic 2- and 3-center nanostructures

We present an \emph{ab initio} theory of ultrafast nanologic elements based on optical $\Lambda$-processes [1]. Using high-level quantum chemistry we show that in 2- and 3-magnetic-center structures containing Fe, Co and Ni as active centers both spin flips and spin transfers are possible within a hundred femtoseconds. Spin transfer can be resolved by a sufficiently large shift of the vibrational stretch frequency of a CO marker [2]. From 3-magnetic-center clusters we are able to construct OR, XOR (CNOT), and AND gates [3]. Thus multicenter magnetic clusters allow to exploit spin dynamics for full-fledged logic functionalization.\\[4pt] [1] G. Lefkidis, G. P. Zhang, and W. H\"{u}bner, PRL (2009, in press)\\[0pt] [2] C. Li, T. Hartenstein, G. Lefkidis and W. H\"{u}bner {\bf 79}, 180413(R) (2009)\\[0pt] [3] W. H\"{u}bner, S. Kersten and G. Lefkidis PRB {\bf 79}, 184431 (2009)