Electrically tuned topology and magnetism in twisted bilayer MoTe$_2$ at $ν_h=1$
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| Format: | Preprint |
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2023
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| _version_ | 1866914644717731840 |
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| author | Li, Bohao Qiu, Wen-Xuan Wu, Fengcheng |
| author_facet | Li, Bohao Qiu, Wen-Xuan Wu, Fengcheng |
| contents | We present a theoretical study of an interaction-driven quantum phase diagram of twisted bilayer MoTe$_2$ at hole filling factor $ν_h=1$ as a function of twist angle $θ$ and layer potential difference $V_z$, where $V_z$ is generated by an applied out-of-plane electric field. At $V_z=0$, the phase diagram includes quantum anomalous Hall insulators in the intermediate $θ$ regime and topologically trivial multiferroic states with coexisting ferroelectricity and magnetism in both small and large $θ$ regimes. There can be two transitions from the quantum anomalous Hall insulator phase to topologically trivial out-of-plane ferromagnetic phase, and finally to in-plane 120$^\circ$ antiferromagnetic phase as $|V_z|$ increases, or a single transition without the intervening ferromagnetic phase. We show explicitly that the spin vector chirality of various 120$^\circ$ antiferromagnetic states can be electrically switched. We discuss the connection between the experimentally measured Curie-Weiss temperature and the low-temperature magnetic order based on an effective Heisenberg model with magnetic anisotropy. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_02217 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Electrically tuned topology and magnetism in twisted bilayer MoTe$_2$ at $ν_h=1$ Li, Bohao Qiu, Wen-Xuan Wu, Fengcheng Mesoscale and Nanoscale Physics Strongly Correlated Electrons We present a theoretical study of an interaction-driven quantum phase diagram of twisted bilayer MoTe$_2$ at hole filling factor $ν_h=1$ as a function of twist angle $θ$ and layer potential difference $V_z$, where $V_z$ is generated by an applied out-of-plane electric field. At $V_z=0$, the phase diagram includes quantum anomalous Hall insulators in the intermediate $θ$ regime and topologically trivial multiferroic states with coexisting ferroelectricity and magnetism in both small and large $θ$ regimes. There can be two transitions from the quantum anomalous Hall insulator phase to topologically trivial out-of-plane ferromagnetic phase, and finally to in-plane 120$^\circ$ antiferromagnetic phase as $|V_z|$ increases, or a single transition without the intervening ferromagnetic phase. We show explicitly that the spin vector chirality of various 120$^\circ$ antiferromagnetic states can be electrically switched. We discuss the connection between the experimentally measured Curie-Weiss temperature and the low-temperature magnetic order based on an effective Heisenberg model with magnetic anisotropy. |
| title | Electrically tuned topology and magnetism in twisted bilayer MoTe$_2$ at $ν_h=1$ |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2310.02217 |