Intertwined fractional quantum anomalous Hall states and charge density waves
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866916175960604672 |
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| author | Song, Xue-Yang Jian, Chao-Ming Fu, Liang Xu, Cenke |
| author_facet | Song, Xue-Yang Jian, Chao-Ming Fu, Liang Xu, Cenke |
| contents | Motivated by the recent experimental breakthrough on the observation of the fractional quantum anomalous Hall (FQAH) effects in semiconductor and graphene moiré materials, we explore the rich physics associated with the coexistence of FQAH effect and the charge density wave (CDW) order that spontaneously breaks the translation symmetry. We refer to a state with both properties as "FQAH-crystal". We show that the interplay between FQAH effect and CDW can lead to a rich phase diagram including multiple topological phases and topological quantum phase transitions at the same moiré filling. In particular, we demonstrate the possibility of direct quantum phase transitions from a FQAH-crystal with Hall conductivity $σ_H = - 2/3$ to a trivial CDW insulator with $σ_H = 0$, and more interestingly, to a QAH-crystal with $σ_H= -1$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_11632 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Intertwined fractional quantum anomalous Hall states and charge density waves Song, Xue-Yang Jian, Chao-Ming Fu, Liang Xu, Cenke Strongly Correlated Electrons Motivated by the recent experimental breakthrough on the observation of the fractional quantum anomalous Hall (FQAH) effects in semiconductor and graphene moiré materials, we explore the rich physics associated with the coexistence of FQAH effect and the charge density wave (CDW) order that spontaneously breaks the translation symmetry. We refer to a state with both properties as "FQAH-crystal". We show that the interplay between FQAH effect and CDW can lead to a rich phase diagram including multiple topological phases and topological quantum phase transitions at the same moiré filling. In particular, we demonstrate the possibility of direct quantum phase transitions from a FQAH-crystal with Hall conductivity $σ_H = - 2/3$ to a trivial CDW insulator with $σ_H = 0$, and more interestingly, to a QAH-crystal with $σ_H= -1$. |
| title | Intertwined fractional quantum anomalous Hall states and charge density waves |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2310.11632 |