2016年8月
Topological edge Mott insulating state in two dimensions at finite temperatures: Bulk and edge analysis
PHYSICAL REVIEW B
- ,
- 巻
- 94
- 号
- 8
- 開始ページ
- 085149 -1
- 終了ページ
- 8
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.94.085149
- 出版者・発行元
- AMER PHYSICAL SOC
We study a bilayer Kane-Mele-Hubbard model with lattice distortion and interlayer spin exchange interaction under cylinder geometry. Our analysis based on real-space dynamical mean field theory with continuous-time quantum Monte Carlo demonstrates the emergence of a topological edge Mott insulating (TEMI) state which hosts gapless edge modes only in collective spin excitations. This is confirmed by the numerical calculations at finite temperatures for the spin-Hall conductivity and the single-particle excitation spectrum; the spin-Hall conductivity is almost quantized, sigma(xy)(spin) similar to 2(e/2 pi), predicting gapless edge modes carrying the spin current, while the helical edge modes in the single-particle spectrum are gapped out with respecting symmetry. It is clarified how the TEMI state evolves from the ordinary spin-Hall insulating state with increasing the Hubbard interaction at a given temperature and then undergoes a phase transition to a trivial Mott insulating state. With a bosonization approach at zero temperature, we further address which collective modes host gapless edge modes in the TEMI state.
- リンク情報
- ID情報
-
- DOI : 10.1103/PhysRevB.94.085149
- ISSN : 2469-9950
- eISSN : 2469-9969
- Web of Science ID : WOS:000382127700002