Guy Cohen, Eli Y. Wilner, Eran Rabani
The reduced dynamics formalism has recently emerged as a powerful tool to study the dynamics of nonequilibrium quantum impurity models in strongly correlated regimes. Examples include the nonequilibrium Anderson impurity model near the Kondo crossover temperature and the nonequilibrium Holstein model, for which the formalism provides an accurate description of the reduced density matrix of the system for a wide range of timescales. In this work, we generalize the formalism to allow for non-system observables such as the current between the impurity and leads. We show that the equation of motion for the reduced observable of interest can be closed with the equation of motion for the reduced density matrix and demonstrate the new formalism for a generic resonant level model.
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http://arxiv.org/abs/1304.2216
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