Universal Magnetic Phases in Twisted Bilayer MoTe <sub>2</sub>

Twisted bilayer MoTe<sub>2</sub> (tMoTe<sub>2</sub>) has emerged as a robust platform for exploring correlated topological phases, yet the evolution of its magnetism and topology with twist angle remains an open question. Here, we systematically map the magnetic phase diagram of tMoTe<sub>2</sub> by using local optical spectroscopy and scanning nanoSQUID-on-tip magnetometry. We identify spontaneous ferromagnetism at filling factors ν = -1 and -3 across twist angles from 2.1° to 3.7°, revealing a universal, twist-angle-insensitive ferromagnetic phase. At 2.1°, we further observe robust ferromagnetism at ν = -5, absent at larger twist angles. Temperature-dependent measurements reveal a contrasting twist-angle dependence of the Curie temperatures between ν = -1 and -3, indicating a distinct interplay between the exchange interactions and bandwidth for the two Chern bands. Despite broken time-reversal symmetry, no topological gap is detected at ν = -3. Our results establish a global framework for understanding and controlling magnetic order in tMoTe<sub>2</sub>.

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Publication Details

Journal
Nano Letters
Published
2025-12-18
DOI
https://doi.org/10.1021/acs.nanolett.5c04751
Citations
1
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
1.25
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article

Universal Magnetic Phases in Twisted Bilayer MoTe 2

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article

Universal Magnetic Phases in Twisted Bilayer MoTe 2

Xiaodong Xu, Andrea F. Young, Takashi Taniguchi, Kenji Watanabe, Chaowei Hu, Canxun Zhang, Ting Cao, Evgeny Redekop, Eric Anderson, Heonjoon Park, Jiun‐Haw Chu, Xiaoyu Liu, Xiaowei Zhang, Weijie Li, Di Xiao, Liang Fu, Christiano W. Beach, Will Holtzmann
article en
1 citations

Abstract

Twisted bilayer MoTe<sub>2</sub> (tMoTe<sub>2</sub>) has emerged as a robust platform for exploring correlated topological phases, yet the evolution of its magnetism and topology with twist angle remains an open question. Here, we systematically map the magnetic phase diagram of tMoTe<sub>2</sub> by using local optical spectroscopy and scanning nanoSQUID-on-tip magnetometry. We identify spontaneous ferromagnetism at filling factors ν = -1 and -3 across twist angles from 2.1° to 3.7°, revealing a universal, twist-angle-insensitive ferromagnetic phase. At 2.1°, we further observe robust ferromagnetism at ν = -5, absent at larger twist angles. Temperature-dependent measurements reveal a contrasting twist-angle dependence of the Curie temperatures between ν = -1 and -3, indicating a distinct interplay between the exchange interactions and bandwidth for the two Chern bands. Despite broken time-reversal symmetry, no topological gap is detected at ν = -3. Our results establish a global framework for understanding and controlling magnetic order in tMoTe<sub>2</sub>.

Nano LettersVol. 25(52)
Centre National de la Recherche Scientifique (FR), University of California, Santa Barbara (US), University of Washington (US), National Institute for Materials Science (JP), Université Paris-Saclay (FR), Centre de Nanosciences et de Nanotechnologies (FR), Massachusetts Institute of Technology (US)
Openalex Percentile: Top 15%
Topological Materials and Phenomena
1.25
DOISourceOpenAlex
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