Tuning ferromagnetic BaFe2(PO4)(2) through a high Chern number topological phase
- Authors
- Song, Young-Joon; Ahn, Kyo-Hoon; Pickett, Warren E.; Lee, Kwan-Woo
- Issue Date
- 20-9월-2016
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.94, no.12
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 94
- Number
- 12
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/87495
- DOI
- 10.1103/PhysRevB.94.125134
- ISSN
- 2469-9950
- Abstract
- There is strong interest in discovering or designing wide-gap Chern insulators. Here we follow a Chern insulator to trivial Mott insulator transition versus interaction strength U in a honeycomb-lattice Fe-based transition-metal oxide, discovering that a spin-orbit coupling energy scale xi = 40 meV can produce and maintain a topologically entangled Chern insulating state against large band structure changes arising from an interaction strength U up to 60 times as large. Within the Chern phase the minimum gap switches from the zone corner K to the zone center Gamma while maintaining the topological structure. At a critical strength U-c, the continuous evolution of the electronic structure encounters a gap closing then reopening, upon which the system reverts to a trivial Mott insulating phase. This Chern insulator phase of honeycomb lattice Fe2+ BaFe2(PO4)(2) corresponds to a large Chern number C = -3 that will provide enhanced anomalous Hall conductivity due to the associated three edge states threading through the bulk gap of 80 meV.
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Collections - College of Science and Technology > Semiconductor Physics in Division of Display and Semiconductor Physics > 1. Journal Articles
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