Band mixing in the quantum anomalous Hall regime of twisted semiconductor bilayers
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866914737781997568 |
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| author | Abouelkomsan, Ahmed Reddy, Aidan P. Fu, Liang Bergholtz, Emil J. |
| author_facet | Abouelkomsan, Ahmed Reddy, Aidan P. Fu, Liang Bergholtz, Emil J. |
| contents | Remarkable recent experiments have observed fractional quantum anomalous Hall (FQAH) effects at zero field and unusually high temperatures in twisted semiconductor bilayer $t$MoTe$_2$. Intriguing observations in these experiments such as the absence of integer Hall effects at twist angles where a fractional Hall effect is observed, do however remain unexplained. The experimental phase diagram as a function of twist angle remains to be established. By comprehensive numerical study, we show that band mixing has large qualitative and quantitative effects on the energetics of competing states and their energy gaps throughout the twist angle range $θ\leq 4^\circ$. This lays the ground for the detailed realistic study of a rich variety of strongly correlated twisted semiconductor multilayers and an understanding of the phase diagram of these fascinating systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_16548 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Band mixing in the quantum anomalous Hall regime of twisted semiconductor bilayers Abouelkomsan, Ahmed Reddy, Aidan P. Fu, Liang Bergholtz, Emil J. Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Remarkable recent experiments have observed fractional quantum anomalous Hall (FQAH) effects at zero field and unusually high temperatures in twisted semiconductor bilayer $t$MoTe$_2$. Intriguing observations in these experiments such as the absence of integer Hall effects at twist angles where a fractional Hall effect is observed, do however remain unexplained. The experimental phase diagram as a function of twist angle remains to be established. By comprehensive numerical study, we show that band mixing has large qualitative and quantitative effects on the energetics of competing states and their energy gaps throughout the twist angle range $θ\leq 4^\circ$. This lays the ground for the detailed realistic study of a rich variety of strongly correlated twisted semiconductor multilayers and an understanding of the phase diagram of these fascinating systems. |
| title | Band mixing in the quantum anomalous Hall regime of twisted semiconductor bilayers |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2309.16548 |