Renormalization-group approach to nonequilibrium Green functionsin correlated impurity systems

T. A. Costi
Phys. Rev. B 55, 3003 – Published 1 February 1997
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Abstract

We present a technique for calculating nonequilibrium 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 nonequilibrium dynamics of the Ohmic two–state problem.

    DOI:https://doi.org/10.1103/PhysRevB.55.3003

    ©1997 American Physical Society

    Authors & Affiliations

    T. A. Costi

    • Institut Laue-Langevin, Boîte Postale 156, 38042 Grenoble, Cedex 9, France
    • and Universität Karlsruhe, Institut für Theorie der Kondensierten Materie, 76128 Karlsruhe, Germany

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    Vol. 55, Iss. 5 — 1 February 1997

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