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Fourth-order perturbation theory for the half-filled Hubbard model in infinite dimensions

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Abstract.

We calculate the zero-temperature self-energy to fourth-order perturbation theory in the Hubbard interaction U for the half-filled Hubbard model in infinite dimensions. For the Bethe lattice with bare bandwidth W, we compare our perturbative results for the self-energy, the single-particle density of states, and the momentum distribution to those from approximate analytical and numerical studies of the model. Results for the density of states from perturbation theory at U/W = 0.4 agree very well with those from the Dynamical Mean-Field Theory treated with the Fixed-Energy Exact Diagonalization and with the Dynamical Density-Matrix Renormalization Group. In contrast, our results reveal the limited resolution of the Numerical Renormalization Group approach in treating the Hubbard bands. The momentum distributions from all approximate studies of the model are very similar in the regime where perturbation theory is applicable, \(U/W \le 0.6\). Iterated Perturbation Theory overestimates the quasiparticle weight above such moderate interaction strengths.

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Authors and Affiliations

  1. Fachbereich Physik, Philipps-Universität Marburg, 35032, Marburg, Germany

    F. Gebhard, S. Mahlert & S. Nishimoto

  2. Institut für Physik, Johannes-Gutenberg Universität Mainz, 55099, Mainz, Germany

    E. Jeckelmann

  3. Institut für Theoretische Physik III, Universität Stuttgart, 70550, Stuttgart, Germany

    R. M. Noack

Authors
  1. F. Gebhard
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  2. E. Jeckelmann
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  3. S. Mahlert
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  4. S. Nishimoto
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  5. R. M. Noack
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Correspondence to F. Gebhard.

Additional information

Received: 9 September 2003, Published online: 30 January 2004

PACS:

71.10.Fd Lattice fermion models (Hubbard model, etc.) - 71.27. + a Strongly correlated electron systems; heavy fermions - 71.30. + h Metal-insulator transitions and other electronic transitions

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Gebhard, F., Jeckelmann, E., Mahlert, S. et al. Fourth-order perturbation theory for the half-filled Hubbard model in infinite dimensions. Eur. Phys. J. B 36, 491–509 (2003). https://doi.org/10.1140/epjb/e2004-00005-5

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  • DOI: https://doi.org/10.1140/epjb/e2004-00005-5

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