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Negativity, Quantum Entanglement in the Two-dimensional Generalized Hubbard Model

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Abstract

Quantum correlation and entanglement in the two-dimensional generalized Hubbard model, which is an important model for superconductors of high critical temperature (high-\(T_c\)) are studied. We analyze the behavior of the entanglement negativity like quantum entanglement quantifier, as a function of the energy gap of the quasi-particles \(\Delta \) and temperature T, with aim to analyze the effect of opening of the gap of the spectrum of excitations and temperature on entanglement negativity. Thus, we obtain a small influence of gap \(\Delta \) on multipartite entanglement and a divergence of the entanglement at \(T= 0\) limit due to the increase quantum fluctuations in this point.

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All data generated or analysed during this study are included in this paper.

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Acknowledgements

This work was partially supported by National Council for Scientific and Technological Development (CNPq) Brazil.

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  1. Department of Physics, Federal Center for Technological Education of Minas Gerais, 30510-000, Belo Horizonte, MG, Brazil

    L. S. Lima

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  1. L. S. Lima
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Lima, L.S. Negativity, Quantum Entanglement in the Two-dimensional Generalized Hubbard Model. Int J Theor Phys 62, 93 (2023). https://doi.org/10.1007/s10773-023-05353-5

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