2013年5月
Phase structure of two-dimensional topological insulators by lattice strong-coupling expansion
PHYSICAL REVIEW B
- ,
- 巻
- 87
- 号
- 20
- 開始ページ
- 205440
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.87.205440
- 出版者・発行元
- AMER PHYSICAL SOC
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-Mele 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."
- リンク情報
- ID情報
-
- DOI : 10.1103/PhysRevB.87.205440
- ISSN : 1098-0121
- eISSN : 1550-235X
- Web of Science ID : WOS:000319678700005