2013年4月5日
Topological phase in a two-dimensional metallic heavy-fermion system
Physical Review B - Condensed Matter and Materials Physics
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- ,
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- 巻
- 87
- 号
- 16
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.87.165109
We report on a topological insulating state in a heavy-fermion system away from half filling, which is hidden within a ferromagnetic metallic phase. In this phase, the cooperation of the RKKY interaction and the Kondo effect, together with the spin-orbit coupling, induces a spin-selective gap, bringing about topologically nontrivial properties. This topological phase is robust against a change in the chemical potential in a much wider range than the gap size. We analyze these remarkable properties by using dynamical mean field theory and the numerical renormalization group. Its topological properties support a gapless chiral edge mode, which exhibits a non-Tomonaga-Luttinger liquid behavior due to the coupling with bulk ferromagnetic spin fluctuations. We also propose that the effects of the spin fluctuations on the edge mode can be detected via the NMR relaxation time measurement. © 2013 American Physical Society.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.87.165109
- ISSN : 1098-0121
- ISSN : 1550-235X
- SCOPUS ID : 84876189822