### 抜粋

The phase structure of two-dimensional topological insulators under a sufficiently strong electron-electron interaction is investigated. The effective theory is constructed by extending the idea of the Kane-Melé model on the graphenelike honeycomb lattice, in terms of U(1) lattice gauge theory (quantum electrodynamics). We analyze the phase structure by the techniques of strong-coupling expansion of lattice gauge theory. As a result, we find that the topological phase structure of the system is modified by the electron-electron interaction. There evolves a new phase with the antiferromagnetism not parallel to the direction pointed by the spin-orbit coupling, in-between the conventional and the topological insulator phases. We also discuss the physical implication of the new phase structure found here, in analogy to the parity-broken phase in lattice quantum chromodynamics, known as the "Aoki phase."

元の言語 | English |
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記事番号 | 205440 |

ジャーナル | Physical Review B - Condensed Matter and Materials Physics |

巻 | 87 |

発行部数 | 20 |

DOI | |

出版物ステータス | Published - 2013 5 29 |

### フィンガープリント

### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics

### これを引用

*Physical Review B - Condensed Matter and Materials Physics*,

*87*(20), [205440]. https://doi.org/10.1103/PhysRevB.87.205440