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Spin and Charge Correlations Effect on Quantum Entanglement for Extended Hubbard Model

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Abstract

The presence of long-range spin and charge correlations underlies a variety of physical phenomena in condensed-matter systems, especially, in qubits systems. This work aims to study quantum entanglement versus spin and charge correlations in qubits systems modeled by 1D Extended Hubbard Model. The considered model is parameterized by on-site coulomb interaction energy U, off-site coulomb interaction energy V and exchange spin-spin interaction γJ, where γ is the anisotropy parameter. In charge space, the quantum entanglement reaches its maximum value for an optimal interatomic distance that checks the condition U = 2V. Moreover, in spin phase the quantum entanglement increases with external magnetic field h, especially, for anisotropic Ising model with γ = 1.

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Authors and Affiliations

  1. Laboratory of Bio-Geosciences and Materials Engineering, Higher Normal School, Hassan II University, Casablanca, Morocco

    S. Harir, A. Zouhair & Y. Boughaleb

  2. Department of Physics and Chemistry, CRMEF, Casablanca – Settat, Morocco

    S. Harir

  3. LPHE-Modeling and Simulation, Faculty of Sciences, University Mohammed V, Rabat, Morocco

    M. Kazaz

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  1. S. Harir
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  2. M. Kazaz
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  4. Y. Boughaleb
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Correspondence to S. Harir.

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Harir, S., Kazaz, M., Zouhair, A. et al. Spin and Charge Correlations Effect on Quantum Entanglement for Extended Hubbard Model. Int J Theor Phys 60, 185–194 (2021). https://doi.org/10.1007/s10773-020-04674-z

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