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arXiv · 2301.09838

Quantum spin Hall insulator on the honeycomb lattice induced by ferromagnetic exchange interaction

Ye-Un An·Song-Jin O·Kwang-Il Ryom·Il-Gwang Son
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Abstract

We study the many-body instabilities of correlated electrons on the half-filled honeycomb lattice with enhanced exchange coupling. The system is described by an extended Hubbard model including the next-nearest-neighbor Coulomb repulsion ($V_2$) and the nearest-neighbor exchange interaction ($J$). We use the truncated unity functional renormalization group approach to determine a schematic ground-state phase diagram with higher resolution in the parameter space of $V_2$ and $J$. In the absence of the on-site repulsion and presence of sizable next-nearest-neighbor repulsion and enhanced nearest-neighbor exchange interaction, we encounter the quantum spin Hall phase, the spin-Kekulé phase, and the three-sublattice and the incommensurate charge-density-wave phases. We propose a scheme for combining consistently the truncated unity functional renormalization group and the mean-field approximation, which is distinct from the conventional one that directly uses the renormalization-group results as an input for the mean-field calculation. This scheme is used to study in detail the quantum spin Hall phase, presenting some characteristics like the bulk gap, the Chern number and the helical edge states.

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Ye-Un An, Song-Jin O, Kwang-Il Ryom, Il-Gwang Son. 2023-01-24. Quantum spin Hall insulator on the honeycomb lattice induced by ferromagnetic exchange interaction. https://doi.org/10.1016/j.physb.2023.414748

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