Universal Magnetic Phases in Twisted Bilayer MoTe$_2$
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arXiv
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2025
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| author | Li, Weijie Redekop, Evgeny Beach, Christiano Wang Zhang, Canxun Zhang, Xiaowei Liu, Xiaoyu Holtzmann, Will Hu, Chaowei Anderson, Eric Park, Heonjoon Taniguchi, Takashi Watanabe, Kenji Chu, Jiun-haw Fu, Liang Cao, Ting Xiao, Di Young, Andrea F. Xu, Xiaodong |
| author_facet | Li, Weijie Redekop, Evgeny Beach, Christiano Wang Zhang, Canxun Zhang, Xiaowei Liu, Xiaoyu Holtzmann, Will Hu, Chaowei Anderson, Eric Park, Heonjoon Taniguchi, Takashi Watanabe, Kenji Chu, Jiun-haw Fu, Liang Cao, Ting Xiao, Di Young, Andrea F. Xu, Xiaodong |
| contents | Twisted bilayer MoTe$_2$ (tMoTe$_2$) has emerged as a robust platform for exploring correlated topological phases, notably supporting fractional Chern insulator (FCI) states at zero magnetic field across a wide range of twist angles. The evolution of magnetism and topology with twist angle remains an open question. Here, we systematically map the magnetic phase diagram of tMoTe$_2$ using local optical spectroscopy and scanning nanoSQUID-on-tip (nSOT) magnetometry. We identify spontaneous ferromagnetism at moiré filling factors $ν= -1$ and $-3$ over a twist angle range from 2.1$^\circ$ to 3.7$^\circ$, revealing a universal, twist-angle-insensitive ferromagnetic phase. At 2.1$^\circ$, we further observe robust ferromagnetism at $ν= -5$, absent in the devices with larger twist angle -- a signature of the flattening of higher bands in this twist angle range. Temperature-dependent measurements reveal a contrasting twist-angle dependence of the Curie temperatures between $ν= -1$ and $ν= -3$, indicating distinct interplay between exchange interaction and bandwidth for the two Chern bands. Despite spontaneous time-reversal symmetry breaking, we find no evidence of a topological gap at $ν= -3$; however, fragile correlated topological phases could be obscured by the device disorder evident in our spatially resolved measurements. Our results establish a global framework for understanding and controlling magnetic order in tMoTe$_2$ and highlight its potential for accessing correlated topological phases in higher energy Chern band. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_22354 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Universal Magnetic Phases in Twisted Bilayer MoTe$_2$ Li, Weijie Redekop, Evgeny Beach, Christiano Wang Zhang, Canxun Zhang, Xiaowei Liu, Xiaoyu Holtzmann, Will Hu, Chaowei Anderson, Eric Park, Heonjoon Taniguchi, Takashi Watanabe, Kenji Chu, Jiun-haw Fu, Liang Cao, Ting Xiao, Di Young, Andrea F. Xu, Xiaodong Mesoscale and Nanoscale Physics Strongly Correlated Electrons Twisted bilayer MoTe$_2$ (tMoTe$_2$) has emerged as a robust platform for exploring correlated topological phases, notably supporting fractional Chern insulator (FCI) states at zero magnetic field across a wide range of twist angles. The evolution of magnetism and topology with twist angle remains an open question. Here, we systematically map the magnetic phase diagram of tMoTe$_2$ using local optical spectroscopy and scanning nanoSQUID-on-tip (nSOT) magnetometry. We identify spontaneous ferromagnetism at moiré filling factors $ν= -1$ and $-3$ over a twist angle range from 2.1$^\circ$ to 3.7$^\circ$, revealing a universal, twist-angle-insensitive ferromagnetic phase. At 2.1$^\circ$, we further observe robust ferromagnetism at $ν= -5$, absent in the devices with larger twist angle -- a signature of the flattening of higher bands in this twist angle range. Temperature-dependent measurements reveal a contrasting twist-angle dependence of the Curie temperatures between $ν= -1$ and $ν= -3$, indicating distinct interplay between exchange interaction and bandwidth for the two Chern bands. Despite spontaneous time-reversal symmetry breaking, we find no evidence of a topological gap at $ν= -3$; however, fragile correlated topological phases could be obscured by the device disorder evident in our spatially resolved measurements. Our results establish a global framework for understanding and controlling magnetic order in tMoTe$_2$ and highlight its potential for accessing correlated topological phases in higher energy Chern band. |
| title | Universal Magnetic Phases in Twisted Bilayer MoTe$_2$ |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.22354 |