Twisted magnetic topological insulators
Motivated by the discovery of the quantum anomalous Hall effect in Cr-doped (Bi,Sb)_{2}Te_{3} thin films, we study the generic states for magnetic topological insulators and explore the physical properties for both magnetism and itinerant electrons. First-principles calculations are exploited to inv...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2021-08-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.3.033156 |
| _version_ | 1797210926471970816 |
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| author | Chao-Kai Li Xu-Ping Yao Gang Chen |
| author_facet | Chao-Kai Li Xu-Ping Yao Gang Chen |
| author_sort | Chao-Kai Li |
| collection | DOAJ |
| description | Motivated by the discovery of the quantum anomalous Hall effect in Cr-doped (Bi,Sb)_{2}Te_{3} thin films, we study the generic states for magnetic topological insulators and explore the physical properties for both magnetism and itinerant electrons. First-principles calculations are exploited to investigate the magnetic interactions between magnetic Co atoms adsorbed on the Bi_{2}Se_{3} (111) surface. Due to the absence of inversion symmetry on the surface, there are Dzyaloshinskii-Moriya-like twisted spin interactions between the local moments of Co ions. These nonferromagnetic interactions twist the collinear spin configuration of the ferromagnet and generate various magnetic orders beyond a simple ferromagnet. Among them, the spin spiral state generates alternating counterpropagating modes across each period of spin states, and the skyrmion lattice even supports a chiral mode around the core of each skyrmion. The skyrmion lattice opens a gap at the surface Dirac point, resulting in the anomalous Hall effect. These results may inspire further experimental investigation of magnetic topological insulators. |
| first_indexed | 2024-04-24T10:18:21Z |
| format | Article |
| id | doaj.art-58bdf662e74245c88929f00cc5515be9 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:18:21Z |
| publishDate | 2021-08-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-58bdf662e74245c88929f00cc5515be92024-04-12T17:12:51ZengAmerican Physical SocietyPhysical Review Research2643-15642021-08-013303315610.1103/PhysRevResearch.3.033156Twisted magnetic topological insulatorsChao-Kai LiXu-Ping YaoGang ChenMotivated by the discovery of the quantum anomalous Hall effect in Cr-doped (Bi,Sb)_{2}Te_{3} thin films, we study the generic states for magnetic topological insulators and explore the physical properties for both magnetism and itinerant electrons. First-principles calculations are exploited to investigate the magnetic interactions between magnetic Co atoms adsorbed on the Bi_{2}Se_{3} (111) surface. Due to the absence of inversion symmetry on the surface, there are Dzyaloshinskii-Moriya-like twisted spin interactions between the local moments of Co ions. These nonferromagnetic interactions twist the collinear spin configuration of the ferromagnet and generate various magnetic orders beyond a simple ferromagnet. Among them, the spin spiral state generates alternating counterpropagating modes across each period of spin states, and the skyrmion lattice even supports a chiral mode around the core of each skyrmion. The skyrmion lattice opens a gap at the surface Dirac point, resulting in the anomalous Hall effect. These results may inspire further experimental investigation of magnetic topological insulators.http://doi.org/10.1103/PhysRevResearch.3.033156 |
| spellingShingle | Chao-Kai Li Xu-Ping Yao Gang Chen Twisted magnetic topological insulators Physical Review Research |
| title | Twisted magnetic topological insulators |
| title_full | Twisted magnetic topological insulators |
| title_fullStr | Twisted magnetic topological insulators |
| title_full_unstemmed | Twisted magnetic topological insulators |
| title_short | Twisted magnetic topological insulators |
| title_sort | twisted magnetic topological insulators |
| url | http://doi.org/10.1103/PhysRevResearch.3.033156 |
| work_keys_str_mv | AT chaokaili twistedmagnetictopologicalinsulators AT xupingyao twistedmagnetictopologicalinsulators AT gangchen twistedmagnetictopologicalinsulators |