Renormalization Group Approach to Non-equilibrium Green Functions in Correlated Impurity Systems

Details Renormalization Group Approach to Non-equilibrium Green Functions in Correlated Impurity Systems Renormalization Group Approach to Non-equilibrium Green Functions in Correlated Impurity Systems

1997-06-10

arxiv.org/abs/cond-mat/9706097v1

Phys.Rev.B55, 3003 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 2 figures

Scientific paper

10.1103/PhysRevB.55.3003

We present a technique for calculating non-equilibrium Green functions for impurity systems with local interactions. We use an analogy to the calculation of response functions in the x-ray problem.The initial state and the final state problems, which correspond to the situations before and after the disturbance (an electric or magnetic field, for example) is suddenly switched on, are solved with the aid of Wilson's momentum shell renormalization group. The method is illustrated by calculating the non-equilibrium dynamics of the ohmic two-state problem.

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