Kondo screening of spin-charge separated fluxons by a helical liquid

@article{Weber2014KondoSO,
  title={Kondo screening of spin-charge separated fluxons by a helical liquid},
  author={Manuel Weber and Martin Hohenadler and Fakher F. Assaad},
  journal={Physical Review B},
  year={2014},
  volume={89},
  pages={205125}
}
The insertion of a magnetic $\pi$ flux into a quantum spin Hall insulator creates four localized, spin-charge separated states: the charge and spin fluxons with either charge $Q=\pm1$ or spin $S_z=\pm1/2$, respectively. In the presence of repulsive Coulomb interactions, the charged states are gapped out and a local moment is formed. We consider the Kane-Mele-Hubbard model on a ribbon with zigzag edges to construct an impurity model where the spin fluxon is screened by the helical edge liquid… 
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