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Linear response within the projector-based renormalization method: many-body corrections beyond the random phase approximation

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Abstract

The explicit evaluation of linear response coefficients for interacting many-particle systems still poses a considerable challenge to theoreticians. In this work we use a novel many-particle renormalization technique, the so-called projector-based renormalization method, to show how such coefficients can systematically be evaluated. To demonstrate the prospects and power of our approach we consider the dynamical wave-vector dependent spin susceptibility of the two-dimensional Hubbard model and also determine the subsequent magnetic phase diagram close to half-filling. We show that the superior treatment of (Coulomb) correlation and fluctuation effects within the projector-based renormalization method significantly improves the standard random phase approximation results.

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Authors and Affiliations

  1. Institute of Research and Development, Duy Tan University, K7/25 Quang Trung, Danang, Vietnam

    Van-Nham Phan

  2. Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, 17489, Greifswald, Germany

    Holger Fehske

  3. Institut für Theoretische Physik, Technische Universität Dresden, 01062, Dresden, Germany

    Klaus W. Becker

Authors
  1. Van-Nham Phan
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  2. Holger Fehske
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  3. Klaus W. Becker
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Correspondence to Klaus W. Becker.

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Phan, VN., Fehske, H. & Becker, K. Linear response within the projector-based renormalization method: many-body corrections beyond the random phase approximation. Eur. Phys. J. B 87, 66 (2014). https://doi.org/10.1140/epjb/e2014-50028-2

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