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COM(3p) Solution of the 2D Hubbard Model: Momentum-Resolved Quantities

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Abstract

Recently, within the framework of the composite operator method, it has been proposed that a three-pole solution for the two-dimensional Hubbard model (Eur. Phys. J. B 87, 45 (2014)),which is still considered as one of the best candidate model to microscopically describe high- T c cuprate superconductors. The operatorial basis comprise the two Hubbard operators (complete fermionic local basis) and the electronic operator dressed by the nearest- neighbor spin fluctuations. The effectiveness of the approximate solution has been proved through a positive comparison with different numerical methods for various quantities. In this article, after recollecting the main analytical expressions defining the solution and the behavior of basic local quantities (double occupancy and chemical potential) and of the quasi-particle energy dispersions, we resolve and analyze the momentum components of relevant quantities: filling (i.e., the momentum distribution function), double occupancy, and nearest neighbor spin correlation function. The analysis is extended to COM(2p) solutions that will be used as a primary reference. Thanks to this, the role played by the third field, with respect to the two Hubbard ones, in determining the behavior of many relevant quantities and in allowing the extremely good comparison with numerical results is better understood giving a guideline to further improve and, possibly, optimize the application of the COM to the Hubbard model.

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Acknowledgments

The author wishes to thank Gerardo Sica for many insightful discussions.

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Authors and Affiliations

  1. Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno, I-84084, Fisciano, (SA), Italy

    Adolfo Avella

  2. Unità CNISM di Salerno, Università degli Studi di Salerno, I-84084, Fisciano, (SA), Italy

    Adolfo Avella

  3. CNR-SPIN, UoS di Salerno, I-84084, Fisciano, (SA), Italy

    Adolfo Avella

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Avella, A. COM(3p) Solution of the 2D Hubbard Model: Momentum-Resolved Quantities. J Supercond Nov Magn 28, 741–750 (2015). https://doi.org/10.1007/s10948-014-2645-6

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