Giant elastoresistance in magic-angle twisted bilayer graphene
Fuente:
arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
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| _version_ | 1866913839985983488 |
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| author | Ma, Xuetao Liu, Zhaoyu Cai, Jiaqi Watanabe, Kenji Taniguchi, Takashi Xu, Xiaodong Chu, Jiun-Haw Yankowitz, Matthew |
| author_facet | Ma, Xuetao Liu, Zhaoyu Cai, Jiaqi Watanabe, Kenji Taniguchi, Takashi Xu, Xiaodong Chu, Jiun-Haw Yankowitz, Matthew |
| contents | Strongly correlated and topological phases in moiré materials are exquisitely sensitive to lattice geometry at both atomic and superlattice length scales. Twist angle, pressure, and strain directly modify the lattice, and thus act as highly effective tuning parameters. Here we examine electrical transport in twisted bilayer graphene subjected to continuous uniaxial strain. Near the magic angle ($\approx 1.1^{\circ}$), devices exhibit a pronounced elastoresistance that depends on band filling and temperature, with a gauge factor more than two orders of magnitude larger than that of conventional metals. In selected doping regimes the elastoresistance exhibits a Curie-Weiss-like temperature divergence. We discuss possible microscopic origins, including nematic fluctuations and enhanced electronic entropy from fluctuating isospin moments. Our work establishes uniaxial strain as a versatile probe of correlated physics in a moiré material. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_10506 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Giant elastoresistance in magic-angle twisted bilayer graphene Ma, Xuetao Liu, Zhaoyu Cai, Jiaqi Watanabe, Kenji Taniguchi, Takashi Xu, Xiaodong Chu, Jiun-Haw Yankowitz, Matthew Mesoscale and Nanoscale Physics Strongly Correlated Electrons Strongly correlated and topological phases in moiré materials are exquisitely sensitive to lattice geometry at both atomic and superlattice length scales. Twist angle, pressure, and strain directly modify the lattice, and thus act as highly effective tuning parameters. Here we examine electrical transport in twisted bilayer graphene subjected to continuous uniaxial strain. Near the magic angle ($\approx 1.1^{\circ}$), devices exhibit a pronounced elastoresistance that depends on band filling and temperature, with a gauge factor more than two orders of magnitude larger than that of conventional metals. In selected doping regimes the elastoresistance exhibits a Curie-Weiss-like temperature divergence. We discuss possible microscopic origins, including nematic fluctuations and enhanced electronic entropy from fluctuating isospin moments. Our work establishes uniaxial strain as a versatile probe of correlated physics in a moiré material. |
| title | Giant elastoresistance in magic-angle twisted bilayer graphene |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.10506 |