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Fluctuating local field approach to the description of lattice models in the strong coupling regime

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Abstract

We consider 2D Hubbard clusters magnetism in the strong coupling regime. We show that the mean field approach does not provide sufficient results. Acting in assumption that the origin of unphysical predictions is the lack of local moment fluctuations, we develop the recently introduced Fluctuating Local Field scheme in the vicinity of atomic limit. Our numerical calculations show significant qualitative improvement of the results obtained within the mean field approach. We supply the discussion of the results with the perspectives for future quantitative improvements.

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Acknowledgements

The work of Ya.S.L. was supported by the MEPhI Program Priority 2030.

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Authors and Affiliations

  1. Russian Quantum Center, Skolkovo Innovation city, Moscow, 121205, Russia

    Yana S. Lyakhova & Alexey N. Rubtsov

  2. National Research Nuclear University MEPhI, Moscow, 115409, Russia

    Yana S. Lyakhova

  3. Physics Department, Moscow State University, 119991, Moscow, Russia

    Alexey N. Rubtsov

Authors
  1. Yana S. Lyakhova
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  2. Alexey N. Rubtsov
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Correspondence to Yana S. Lyakhova.

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Lyakhova, Y.S., Rubtsov, A.N. Fluctuating local field approach to the description of lattice models in the strong coupling regime. J Supercond Nov Magn 35, 2169–2173 (2022). https://doi.org/10.1007/s10948-022-06303-8

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