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Cited by 308

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Topological insulators and Mott physics from the Hubbard interaction

Open access
Rachel, Stephan, Le Hur, Karyn·2010·Physical Review B

Abstract

We investigate the Hubbard model on the honeycomb lattice with intrinsic spin-orbit interactions as a paradigm for two-dimensional topological band insulators in the presence of interactions. Applying a combination of Hartree-Fock theory, slave-rotor techniques, and topological arguments, we show that the topological band insulating phase persists up to quite strong interactions. Then we apply the slave-rotor mean-field theory and find a Mott transition at which the charge degrees of freedom become localized on the lattice sites. The spin degrees of freedom, however, are still described by the original Kane-Mele band structure. Gauge-field effects in this region play an important role. When the honeycomb layer is isolated then the spin sector becomes already unstable toward an easy-plane Neel order. In contrast, if the honeycomb lattice is surrounded by extra ``screening'' layers with gapless spinons, then the system will support a fractionalized topological insulator phase with gapless spinons at the edges. For large interactions, we derive an effective spin Hamiltonian.

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Metadata

Authors
Rachel, S., & Le Hur, K.
Venue
Physical Review B
Published
2010-08-05
Volume
82
Issue
7
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
OpenAlex
W1965848318
Cited by
308
References
23
FWCI
16.37
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Topological insulators and Mott physics from the Hubbard interaction. https://app.cochat.ai/papers/10.1103/physrevb.82.075106
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Rachel, S., & Le Hur, K. (2010). Topological insulators and Mott physics from the Hubbard interaction. Physical Review B. https://doi.org/10.1103/physrevb.82.075106

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