Multimechanism quantum anomalous Hall and Chern number tunable states in germanene (silicene, stanene)/$M$Bi$_2$Te$_4$ heterostructures
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910489775177728 |
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| author | Li, Zhe Zhang, Jiatong Hong, Xiyu Feng, Xiao He, Ke |
| author_facet | Li, Zhe Zhang, Jiatong Hong, Xiyu Feng, Xiao He, Ke |
| contents | By constructing germanene (silicene, stanene)/$M$Bi$_2$Te$_4$ ($M$ = 3d-transition elements) heterostructures, we discovered and designed multimechanism quantum-anomalous-Hall (QAH) systems, including $Γ$-based QAH, $K$-$K'$-connected QAH, and valley-polarized $K$- or $K'$-based QAH states via first-principle computations. The unique systems possess a global gap and tunable Chern number. The coexisting conventional $Γ$-based QAH state of $M$Bi$_2$Te$_4$ and valley-polarized $K$($K'$)-based QAH state of germanene (silicene, stanene), with opposite chirality, can interact with each other. Adjusting magnetic configurations of $M$Bi$_2$Te$_4$-layers not only switch on (off) the QAH conductance, but also modulate Chern numbers exactly. For example, the germanene/bilayer-NiBi$_2$Te$_4$ possesses the Chern number $C = +1$ in ferromagnetic couplings and $C = +2$ in antiferromagnetic couplings. The novel multimechanism QAH insulators, which are achievable in experiments, provide a new approach to spintronics and valleytronics based on topological states of matter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_08490 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multimechanism quantum anomalous Hall and Chern number tunable states in germanene (silicene, stanene)/$M$Bi$_2$Te$_4$ heterostructures Li, Zhe Zhang, Jiatong Hong, Xiyu Feng, Xiao He, Ke Materials Science By constructing germanene (silicene, stanene)/$M$Bi$_2$Te$_4$ ($M$ = 3d-transition elements) heterostructures, we discovered and designed multimechanism quantum-anomalous-Hall (QAH) systems, including $Γ$-based QAH, $K$-$K'$-connected QAH, and valley-polarized $K$- or $K'$-based QAH states via first-principle computations. The unique systems possess a global gap and tunable Chern number. The coexisting conventional $Γ$-based QAH state of $M$Bi$_2$Te$_4$ and valley-polarized $K$($K'$)-based QAH state of germanene (silicene, stanene), with opposite chirality, can interact with each other. Adjusting magnetic configurations of $M$Bi$_2$Te$_4$-layers not only switch on (off) the QAH conductance, but also modulate Chern numbers exactly. For example, the germanene/bilayer-NiBi$_2$Te$_4$ possesses the Chern number $C = +1$ in ferromagnetic couplings and $C = +2$ in antiferromagnetic couplings. The novel multimechanism QAH insulators, which are achievable in experiments, provide a new approach to spintronics and valleytronics based on topological states of matter. |
| title | Multimechanism quantum anomalous Hall and Chern number tunable states in germanene (silicene, stanene)/$M$Bi$_2$Te$_4$ heterostructures |
| topic | Materials Science |
| url | https://arxiv.org/abs/2401.08490 |