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<p>The ground state phase diagram of the extended Hubbard model on a half-filled 5-7 (or 5/7) skewed ladder is investigated using a mean-field (unrestricted Hartree-Fock theory) approach. By computing site-resolved charge and spin densities, various electronic and magnetic phases are mapped in the <i>U</i>/<i>t</i>-<i>V</i>/<i>t</i> parameter space. The electronic phases identified include a partially charge-ordered metallic or insulating phase, as well as a fully charge-ordered insulating phase. The magnetic phases range from non-magnetic and spin density wave states to spin-split compensated ferrimagnetic and partially antiferromagnetic states. The mean-field results are further validated using density matrix renormalization group (DMRG) calculation. Band structure analysis indicates that the partially charge-ordered compensated ferrimagnetic phase exhibits spin polarization, a property of potential interest for spintronics applications. Furthermore, electric polarization as a function of <i>U</i>/<i>t</i> evaluated using the Berry phase formalism, reveals that the system displays multiferroic behavior, characterized by coexisting compensated ferrimagnetism and electronic polarization. These properties highlight their potential relevance in device applications. The up- and down- spin currents calculated using non-equilibrium Green’s function technique further divulge the possibility of strong spin polarization even under small applied bias, which is important from a spintronics application viewpoint.</p>

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Unconventional electronic and magnetic ground states of 5-7 skewed ladder in the extended Hubbard model

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月31日

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  • Sishir Jana,
  • Dayasindhu Dey,
  • Manoranjan Kumar,
  • S. Ramasesha,
  • Rajamani Raghunathan

摘要

The ground state phase diagram of the extended Hubbard model on a half-filled 5-7 (or 5/7) skewed ladder is investigated using a mean-field (unrestricted Hartree-Fock theory) approach. By computing site-resolved charge and spin densities, various electronic and magnetic phases are mapped in the U/t-V/t parameter space. The electronic phases identified include a partially charge-ordered metallic or insulating phase, as well as a fully charge-ordered insulating phase. The magnetic phases range from non-magnetic and spin density wave states to spin-split compensated ferrimagnetic and partially antiferromagnetic states. The mean-field results are further validated using density matrix renormalization group (DMRG) calculation. Band structure analysis indicates that the partially charge-ordered compensated ferrimagnetic phase exhibits spin polarization, a property of potential interest for spintronics applications. Furthermore, electric polarization as a function of U/t evaluated using the Berry phase formalism, reveals that the system displays multiferroic behavior, characterized by coexisting compensated ferrimagnetism and electronic polarization. These properties highlight their potential relevance in device applications. The up- and down- spin currents calculated using non-equilibrium Green’s function technique further divulge the possibility of strong spin polarization even under small applied bias, which is important from a spintronics application viewpoint.